Abscess (cutaneous)MANAGEMENT

INFECTIOUS DISEASE PRESENTATIONS · 12 SECTIONS

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629 items

☷ Legend

01Approach to the Critical Patient/attcp52

Immediate priorities

›Immediate priorities

›Airway concern

›Facial swelling with airway compromise risk

›Oropharyngeal floor or submandibular involvement

›Shock or severe sepsis concern

›Hypotension

›Altered mental status

›Lactate elevation

›Necrotizing soft tissue infection concern

›Pain out of proportion

›Rapid progression over hours

›Skin anesthesia

›Bullae

›Crepitus

›Dusky or violaceous discoloration

›Deep space infection concern

›Perineal or perirectal involvement

›Hand deep space involvement

›Neck deep space involvement

›Immediate escalation triggers

›If hemodynamic instability, resuscitation bay

›If necrotizing infection concern, immediate surgical consultation

›If perineal involvement with systemic toxicity, urgent surgery consultation for Fournier concern

Early decision points

›Early decision points

›Purulent collection likely

›Incision and drainage as definitive therapy

›Antibiotics as adjunct based on severity and risk

›Cellulitis without drainable collection likely

›Antibiotics without incision and drainage

›Reassessment within 24 to 48 hours if uncertain

›Source control feasibility

›Bedside drainage appropriate

›Operating room drainage needed

›Admission need

›Systemic toxicity

›Rapid progression

›High risk host

›High risk location

Monitoring and initial orders

›Monitoring and initial orders

›Vitals trend

›Persistent tachycardia

›Fever

›Hypotension

›Analgesia plan

›Local anesthesia adequacy

›Procedural sedation consideration

›Point of care ultrasound availability

›Drainable fluid confirmation

›Adjacent vessels identification

›Early antibiotics when indicated

›If systemic toxicity, initiate within 1 hour of recognition

›If necrotizing infection concern, broad spectrum coverage plus MRSA coverage

02History/hx58

Symptom pattern and timeline

›Symptom pattern and timeline

›Onset

›Hours versus days

›Rapid enlargement

›Pain features

›Pain severity

›Pain out of proportion

›Drainage

›Purulent drainage

›Spontaneous rupture

›Prior lesion at site

›Cyst history

›Recurrent boils

›Systemic symptoms

›Fever

›Chills

›Malaise

Exposures and risk factors

›Exposures and risk factors

›MRSA risk

›Prior MRSA infection or colonization

›Household contact with recurrent skin infections

›Contact sports

›Crowded living conditions

›Recent incarceration

›Skin barrier disruption

›Shaving

›Friction

›Eczema

›Wound or abrasion

›Specific exposures

›Animal bite

›Human bite

›Freshwater exposure

›Saltwater exposure

›Hot tub exposure

›Foreign body concern

›Splinter

›Injection site

›Recent procedure

Host factors and comorbidities

›Host factors and comorbidities

›Diabetes mellitus

›Hyperglycemia history

›Neuropathy

›Immunocompromise

›Chronic corticosteroids

›Chemotherapy

›Transplant

›Advanced HIV

›Vascular risk

›Peripheral arterial disease

›Chronic edema

›Recurrent disease syndromes

›Hidradenitis suppurativa

›Atopic dermatitis

›Medication allergies

›Sulfonamide allergy

›Tetracycline allergy

›Beta lactam allergy

03Physical Exam/exam51

Lesion assessment

›Lesion assessment

›Location

›Face

›Hand

›Perineum

›Perirectal

›Breast

›Axilla or groin

›Size and depth estimate

›Max diameter

›Induration extent

›Fluctuance

›Central fluctuance

›Multiloculated feel

›Overlying skin changes

›Erythema

›Warmth

›Tense skin

›Spontaneous drainage

›Surrounding cellulitis extent

›Margin estimate

›Lymphangitic streaking

Severity and complications screen

›Severity and complications screen

›Systemic toxicity

›Fever

›Tachycardia

›Hypotension

›Necrotizing infection signs

›Pain out of proportion

›Skin anesthesia

›Bullae

›Crepitus

›Ecchymosis or violaceous discoloration

›Neurovascular status when near extremity compartments

›Distal pulses

›Capillary refill

›Sensation

›Motor function

›Adjacent structure involvement

›Joint involvement concern near joints

›Tendon sheath involvement concern in hand

PITFALLS

›PITFALLS

›Induration without fluctuance still compatible with early abscess

›POCUS improves detection of small collections

›Reassessment plan when uncertain

›Pain out of proportion requires necrotizing infection consideration

›Early surgical involvement threshold low

›Facial triangle infections higher complication risk

›Lower threshold for specialist evaluation

›Perineal infections polymicrobial risk

›Broader antibiotic coverage when systemic features present

04Differential Diagnosis/ddx42

Purulent and nonpurulent mimics

›Purulent and nonpurulent mimics

›Cellulitis without abscess

›Diffuse erythema without focal fluctuance

›POCUS without drainable collection

›Furuncle and carbuncle

›Follicular origin

›Multiple draining points in carbuncle

›Inflamed epidermoid cyst

›Punctum

›Keratinous material

›Hidradenitis suppurativa flare

›Axillary or groin distribution

›Sinus tracts or scarring

›Hematoma

›Trauma history

›POCUS heterogeneous clot appearance

›Septic bursitis

›Over bursa location

›Preserved joint range compared with septic arthritis

›Septic arthritis

›Pain with passive range of motion

›Effusion

›Pyomyositis

›Deep muscle pain

›Systemic features

›Necrotizing soft tissue infection

›Rapid progression

›Disproportionate pain

›Herpes simplex or zoster

›Vesicles

›Dermatomal distribution

Coding alignment

›Coding alignment

›Cutaneous abscess ICD 10

›L02 category by anatomic site

›Cellulitis ICD 10

›L03 category by anatomic site

›Hidradenitis suppurativa ICD 10

›L73.2

›Necrotizing fasciitis ICD 10

›M72.6

›Fournier gangrene ICD 10

›N49.3

05Laboratory Tests/lt39

When labs add value

›When labs add value

›Mild localized abscess without systemic features

›Routine labs usually not required

›Focus on source control

›Systemic features or high risk host

›Broader evaluation for sepsis

›Baseline renal function for antibiotic selection

›Necrotizing infection concern

›Labs support risk stratification

›Labs never exclude necrotizing infection

Core labs for complicated presentations

›Core labs for complicated presentations

›Complete blood count

›Leukocytosis support for systemic infection

›Neutropenia in immunocompromised host

›Basic metabolic panel

›Creatinine for dosing adjustment

›Sodium for severe infection risk context

›Serum glucose

›Hyperglycemia as severity marker

›Undiagnosed diabetes signal

›C reactive protein

›Trend support in severe infection

›Limited specificity

›Lactate

›Elevated lactate supports hypoperfusion concern

›Normal lactate does not exclude severe infection

Microbiology

›Microbiology

›Abscess material culture

›Recurrent infection

›Severe infection

›Immunocompromise

›Treatment failure

›Blood cultures

›Systemic toxicity

›Immunocompromise

›Suspected endovascular source

›MRSA colonization testing

›Recurrent disease evaluation context

›Limited acute management impact

06Diagnostic Tests/dt59

Scoring Systems

›Scoring systems

›SIRS criteria for infection severity

›Temperature abnormality

›Tachycardia

›Tachypnea

›White blood cell abnormality

›qSOFA for sepsis risk stratification

›Altered mentation

›Systolic blood pressure 100 mmHg or less

›Respiratory rate 22 or more

›LRINEC for necrotizing infection risk context

›C reactive protein

›White blood cell count

›Hemoglobin

›Sodium

›Creatinine

›Glucose

›LRINEC limitations

›Low sensitivity in early disease

›Not a rule out tool

›Surgical evaluation priority over score

MRI

›MRI indications and limits

›Deep soft tissue infection mapping

›Suspected pyomyositis

›Suspected osteomyelitis near chronic wound

›Necrotizing infection evaluation adjunct

›Fascial edema patterns

›Delay risk if unstable

›Contraindications and barriers

›Hemodynamic instability

›Implanted device restrictions

›Limited availability

›CT indications and limits

›Deep space infection concern

›Perirectal abscess mapping

›Neck deep space infection mapping

›Hand deep space infection mapping

›Gas in soft tissues evaluation

›Necrotizing infection concern

›Clostridial myonecrosis concern

›Contrast considerations

›Renal dysfunction risk assessment

›Allergy history context

›CT limitations

›Early necrotizing infection can have normal imaging

›Imaging does not replace surgical consultation when high suspicion

Ultrasound

›Ultrasound applications

›POCUS for abscess versus cellulitis

›Hypoechoic or anechoic collection

›Cobblestoning pattern for cellulitis

›Procedural guidance

›Vessel and nerve avoidance

›Deep collection localization

›Foreign body detection

›Radiolucent foreign bodies

›Surrounding fluid collection

›Ultrasound limitations

›Overlying gas limits view

›Operator dependence

07Disposition/dispo36

Discharge criteria

›Discharge criteria

›Adequate source control

›Successful drainage

›No concern for deep extension

›Clinical stability

›Normal blood pressure

›No persistent tachycardia after analgesia and fluids

›No altered mental status

›Pain control

›Oral analgesia effective

›Reliable follow up

›Wound check in 24 to 48 hours when packing or high risk

›Return precautions understood

Admission and higher level care criteria

›Admission and higher level care criteria

›Systemic toxicity

›Persistent fever

›Hypotension

›Rising lactate

›Rapid progression or extensive cellulitis

›Expanding erythema despite initial therapy

›Lymphangitis with systemic symptoms

›High risk host

›Significant immunocompromise

›Uncontrolled diabetes

›Neutropenia

›High risk location or complexity

›Face with orbital risk

›Hand deep space concern

›Perineal involvement

›Perirectal abscess

›Inadequate source control

›Unable to drain at bedside

›Multiloculated large abscess needing operative management

›Failure of outpatient management

›Worsening after 48 hours

›Persistent or recurrent abscess despite appropriate therapy

08Treatment/t166

Source control procedures

›Source control procedures

›Incision and drainage indications

›Fluctuant abscess

›POCUS confirmed fluid collection

›Spontaneously draining abscess with retained cavity

›Contraindications to bedside drainage

›Pulsatile mass concern

›Overlying vascular graft

›Proximity to critical structures without imaging guidance

›Technique essentials

›Skin antisepsis

›Adequate local anesthesia

›Linear incision over point of maximal fluctuance

›Blunt dissection to break loculations

›Copious irrigation consideration

›Drainage adjuncts

›Loop drainage for select abscesses

›Pediatric friendly option

›Less packing discomfort

›Packing considerations

›Large cavity

›Significant loculations

›Avoid routine packing for small simple abscesses when not needed

›Culture collection when indicated

›Recurrent infection

›Severe infection

›Immunocompromise

›Procedural analgesia and sedation

›Regional block option by location

›Digital block for finger lesions

›Field block for larger lesions

›Procedural sedation consideration

›Large abscess

›Severe pain or anxiety

›Pediatric cooperation limitation

Antibiotics decision framework

›Antibiotics decision framework

›Incision and drainage alone often sufficient for uncomplicated abscess

›Small localized abscess

›No systemic features

›Antibiotics adjunct indications

›Systemic signs of infection

›Extensive surrounding cellulitis

›Multiple abscesses

›Immunocompromise

›Extremes of age

›Difficult to drain location

›Inadequate drainage or concern for deep extension

›Recurrent abscess

›Pathogen coverage targets

›Community acquired MRSA coverage when purulent infection

›Streptococcal coverage when significant nonpurulent cellulitis component

›Polymicrobial coverage when perineal or bite associated infection

Oral antibiotics for outpatient therapy

›Oral antibiotics for outpatient therapy

›MRSA active options for purulent infection

›Trimethoprim sulfamethoxazole

›Adult dosing

›1 double strength tablet orally twice daily

›High severity adult dosing option 2 double strength tablets orally twice daily

›Pediatric dosing

›Trimethoprim component 8 to 12 mg per kg per day divided twice daily

›Key cautions

›Hyperkalemia risk

›Renal dosing adjustment

›Sulfonamide allergy

›Doxycycline

›Adult dosing

›100 mg orally twice daily

›Pediatric dosing

›Avoid under 8 years in most cases

›Key cautions

›Photosensitivity

›Pregnancy avoidance

›Clindamycin

›Adult dosing

›300 to 450 mg orally three times daily

›Pediatric dosing

›10 to 13 mg per kg per dose orally three times daily

›Key cautions

›Diarrhea and C difficile risk

›Local resistance variability

›Streptococcal coverage when prominent cellulitis

›Cephalexin

›Adult dosing

›500 mg orally four times daily

›Pediatric dosing

›25 to 50 mg per kg per day divided 3 to 4 times daily

›Amoxicillin

›Adult dosing

›500 mg orally three times daily

›Pediatric dosing

›25 to 50 mg per kg per day divided 2 to 3 times daily

›Combined strategy when both MRSA and streptococcal coverage needed

›Trimethoprim sulfamethoxazole plus beta lactam

›Trimethoprim sulfamethoxazole dosing as above

›Cephalexin dosing as above

›Doxycycline plus beta lactam

›Doxycycline dosing as above

›Cephalexin dosing as above

›Clindamycin monotherapy option

›Use when local MRSA susceptibility supports

›C difficile risk context

Intravenous antibiotics for severe infection

›Intravenous antibiotics for severe infection

›MRSA coverage

›Vancomycin

›Initial dosing

›15 to 20 mg per kg IV per dose

›Typical interval every 8 to 12 hours

›Monitoring

›Trough or AUC guided strategy per local protocol

›Renal function monitoring

›Linezolid

›Adult dosing

›600 mg IV every 12 hours

›Key cautions

›Serotonergic drug interaction risk

›Thrombocytopenia with prolonged use

›Daptomycin

›Adult dosing

›4 mg per kg IV daily for complicated skin infection context

›Key cautions

›Creatine kinase monitoring

›Avoid for pneumonia

›Ceftaroline

›Adult dosing

›600 mg IV every 12 hours

›Key cautions

›Beta lactam allergy context

›Broad spectrum coverage when polymicrobial risk or necrotizing infection concern

›Piperacillin tazobactam

›Adult dosing

›4.5 g IV every 6 to 8 hours

›Key cautions

›Renal dosing adjustment

›Cefepime plus metronidazole option

›Cefepime

›2 g IV every 8 to 12 hours

›Metronidazole

›500 mg IV every 8 hours

›Add clindamycin for toxin suppression when necrotizing infection concern

›Adult dosing

›900 mg IV every 8 hours

Adjunctive care

›Adjunctive care

›Analgesia

›Acetaminophen dosing per age and weight

›NSAID use when no contraindication

›Short course opioid only if severe pain and appropriate

›Tetanus prophylaxis

›Update based on immunization status and wound classification

›MRSA decolonization for recurrent disease context

›Intranasal mupirocin course consideration

›Chlorhexidine body wash course consideration

›Household hygiene measures

›Wound follow up plan

›Packing removal timing

›Recheck timing 24 to 48 hours when high risk

Evidence levels and guideline style statements

›Evidence levels and guideline style statements

›Incision and drainage as primary therapy for uncomplicated cutaneous abscess

›ACEP Level B recommendation

›Adjunct antibiotics after drainage improve cure for some uncomplicated abscesses

›ACEP Level B recommendation

›Antibiotics indicated for abscess with systemic signs or extensive cellulitis

›Class I recommendation

›Ultrasound improves identification of drainable collections in equivocal exam

›ACEP Level B recommendation

›Necrotizing infection concern requires immediate surgical evaluation without imaging delay

›Class I recommendation

09Special Populations/sp39

Pregnancy

›Pregnancy

›Diagnostic considerations

›Lower threshold for systemic evaluation when febrile

›POCUS preferred when imaging needed

›Antibiotic selection

›Avoid doxycycline

›Fetal tooth and bone effects concern

›Trimethoprim sulfamethoxazole precautions

›First trimester folate antagonism concern

›Near term neonatal jaundice risk context

›Preferred options when appropriate

›Clindamycin when susceptible

›Beta lactams for streptococcal coverage

›Disposition considerations

›Lower threshold admission with systemic features

›Obstetric coordination when severe infection

Geriatric

›Geriatric

›Presentation differences

›Blunted fever response

›Atypical mental status changes

›Medication considerations

›Renal dosing adjustment need

›Higher adverse effect risk

›Disposition considerations

›Lower threshold admission with frailty

›Home wound care feasibility assessment

Pediatrics

›Pediatrics

›Procedure considerations

›Topical anesthetic adjunct options

›Sedation readiness for large painful lesions

›Antibiotic dosing

›Weight based dosing with max adult caps

›Local MRSA susceptibility relevance

›Return precautions emphasis

›Worsening fever

›Decreased intake

›Lethargy

›Disposition considerations

›Lower threshold observation in infants with fever

10Background/b42

Epidemiology

›Epidemiology

›Common emergency presentation within skin and soft tissue infections

›Community acquired MRSA as frequent pathogen in purulent infections

›Recurrent disease common in household clusters

›Anatomic patterns

›Follicular origin common in furuncles

›Axillary and groin clustering in hidradenitis

›Complication risk groups

›Diabetes mellitus

›Immunocompromise

›Peripheral vascular disease

Pathophysiology

›Pathophysiology

›Localized collection of pus in dermis or subcutaneous tissue

›Neutrophil accumulation

›Liquefaction necrosis

›Surrounding cellulitis

›Inflammatory edema and bacterial spread in dermis

›Lymphangitic involvement possible

›Progression pathways

›Spontaneous drainage

›Extension to deeper fascia or muscle in severe cases

›Microbiology patterns

›Staphylococcus aureus common in purulent abscess

›Streptococci common in nonpurulent cellulitis component

›Polymicrobial organisms in perineal and bite associated infections

Therapeutic Considerations

›Therapeutic considerations

›Source control as key determinant of cure

›Antibiotics alone inadequate for many abscesses without drainage

›Antibiotic benefit strongest in selected groups

›Systemic signs

›Extensive cellulitis

›High risk hosts

›Larger lesions

›Resistance and stewardship

›Local antibiogram relevance

›Narrowing therapy after culture when available

›Procedure choices impact comfort and follow up needs

›Loop drainage may reduce packing related pain

›Routine packing not always beneficial for small simple abscesses

›Harm prevention

›Avoid incision over critical neurovascular structures

›Imaging guidance for deep or high risk locations

11Patient Discharge Instructions/pdi32

Copy discharge instructions

›Copy discharge instructions

›Wound care

›Keep dressing clean and dry for first 24 hours

›Daily gentle washing after 24 hours

›Warm compresses 10 to 15 minutes several times daily

›Drainage expectations

›Continued mild drainage for 24 to 72 hours can be normal

›Sudden increase in swelling or pain after initial improvement needs reassessment

›Packing or loop care when used

›Follow up for recheck and removal in 24 to 48 hours

›Do not remove at home unless instructed

›Medications

›Complete prescribed antibiotic course if given

›Take pain medications as directed

›Return to emergency care now for red flags

›Fever or chills

›Rapidly spreading redness

›Worsening pain

›Red streaking up the limb

›New numbness or weakness near the site

›Persistent vomiting or inability to keep fluids down

›Confusion or fainting

›Black or purple skin change

›Severe pain out of proportion

›Follow up

›Primary care or wound check in 24 to 48 hours if packing used or high risk

›Earlier follow up if symptoms worsen

›Prevention

›Avoid sharing towels or razors

›Cover draining wounds

›Hand hygiene

›Clean high touch surfaces during outbreaks in household

12References/r13

Clinical guidelines and key sources

›Clinical guidelines and key sources

›Infectious Diseases Society of America guideline for skin and soft tissue infections

›Purulent infection management with incision and drainage as primary therapy

›Antibiotic selection based on severity and MRSA risk

›Emergency medicine clinical policy topics for skin and soft tissue infection evaluation

›Ultrasound utility for abscess identification

›Antibiotics role after drainage in selected patients

›Surgical principles for necrotizing soft tissue infections

›Early surgical exploration priority when suspected

›Broad spectrum antibiotics plus MRSA coverage when suspected

›Antimicrobial stewardship principles for outpatient SSTI

›Use local antibiogram for empiric choices

›Narrow therapy when culture results available

Evidence & Review

Reviewed by SymptomDx Medical Team · Last reviewed June 16, 2026

SymptomDx is an educational tool for medical professionals. It does not replace clinical judgment. Verify all clinical data and drug dosages with authoritative sources.