The incision is the cure. Antibiotics are the adjunct, not the treatment — an abscess with an intact roof gets worse on antibiotics alone, and an abscess opened adequately usually gets better without them.
The two failure modes are the same failure: an opening too small to drain the cavity, and loculations left intact behind it.
Scalpel, hemostat or curette, irrigation syringe, gauze stacks, packing strip or vessel loop, absorbent dressing. Culture swab if it will change management.
Abscesses are under pressure. Face shield, gown, absorbent pads, and the incision aimed away from you. Patient lying down.
Ultrasound confirms pus, maps depth and loculations, and finds the vessel you don't want to hit. Anesthetize per institutional reference — a field block around the cavity beats infiltrating inflamed tissue.
POCUS over the point of maximal fluctuance · note depth and neighbors
Induration without a pocket is cellulitis — cutting it yields blood, pain, and a callback. Ultrasound shows the pocket, its depth, loculations, and any vessel in the path. Mark the point of maximal fluctuance.
#11 blade · over maximal fluctuance · parallel to skin creases
One deliberate incision through the roof, oriented along the skin tension lines for a better scar, spanning roughly two-thirds of the cavity's diameter (Fig. 1). Expect pressurized pus — that's what the shield is for.
Hemostat sweep · every quadrant · until the walls feel smooth
Insert a closed hemostat, open it, and sweep the cavity in all directions until no septations remain and the walls feel uniform. This is the most therapeutic and most skipped step. Express residual pus with gentle circumferential pressure.
Irrigate the cavity · pack loosely if at all · or place a loop
Irrigate until the return runs clear. Small, well-drained cavities generally need nothing in them. For larger cavities, either a loosely placed wick of packing strip to hold the incision open, or a loop drain (vessel loop through two incisions, tied loosely) — loop drainage is better tolerated, especially in children, and avoids repeat packing visits.
Absorbent dressing · recheck 48 hours if packed or high-risk
Absorbent dressing over the site. Packed wounds and high-risk patients (diabetes, immunocompromise, large cavities) get a 48-hour recheck. Antibiotics are an adjunct decided by your local guidance — typically for surrounding cellulitis, systemic signs, or host risk factors, not for a simple drained abscess. Warm soaks after 24–48 hours help it keep draining.
| Scenario | Call | Why |
|---|---|---|
| Simple, drained, well | home | Wound care, return precautions, recheck if packed. Antibiotics per local guidance. |
| Surrounding cellulitis | home + abx | Drainage plus antibiotics; mark the margins so progression is visible at recheck |
| Systemic signs | workup | Fever, tachycardia, or ill appearance after drainage means the abscess wasn't the whole story |
| Hand deep space, neck, perirectal | consult | Bedside I&D is inadequate; these need the OR before they need you |
| Pain out of proportion | stop | Crepitus, bullae, rapidly advancing margins — think necrotizing infection, not a bigger incision |
POCUS changes management in a meaningful fraction of "obvious" skin infections — finding the pocket cellulitis was hiding, or proving there's nothing to drain. It also shows you the artery next door.
Local anesthetic works poorly in the acidic environment of an abscess. A field block around the cavity, adequate time of onset, and honest consideration of sedation for large collections make the difference between a complete job and a partial one.
A 5 mm nick in a 4 cm abscess reseals within a day and comes back angrier. The incision must be long enough to drain the cavity and stay open while it heals from the bottom up.
Pus out under pressure feels like success, but loculated pockets left behind are the classic cause of the 48-hour bounce-back. The hemostat sweep is the difference between drainage and decompression.
Routine packing of small abscesses adds pain and follow-up visits without reducing recurrence. Pack loosely, pack selectively, or use a loop drain — and never pack so tight it plugs.
Not every red lump is an abscess: inguinal hernias, lymph nodes, pseudoaneurysms in people who inject drugs, and necrotizing infections have all met a scalpel that should have met an ultrasound first.
A starting template for the procedure note. Text in brackets [ ] and pick-lists in { } are fields to complete. Save it as a SmartPhrase, then edit every field to match the actual procedure.
PROCEDURE: INCISION AND DRAINAGE OF ABSCESS
Site: [***] Size: *** x *** cm
Consent: {verbal : written} consent obtained; risks including
pain, bleeding, scarring, recurrence, and need for further
drainage discussed. Timeout performed. Operator: @ME@
Bedside ultrasound: {fluid collection confirmed, *** cm deep :
not performed}. Anesthesia: [agent/technique per institutional
protocol ***].
Procedure: site prepped. Incision made with #11 blade over
point of maximal fluctuance, *** cm, along skin tension lines.
{Purulent : serosanguinous} drainage expressed, ~*** mL.
Loculations broken with hemostat; cavity irrigated until clear.
{Packing placed loosely : loop drain placed : no packing}.
Culture: {sent : not sent}.
Complications: {none : ***}
EBL: minimal
Aftercare: wound care and return precautions given.
Recheck in {48 hours : *** days}. Antibiotics: {none :
prescribed per local guidance ***}.
Electronically signed: @ME@ @TD@ @NOW@
Sample template only — not a validated institutional SmartPhrase. Verify wording, consent, and attestation requirements against your department's documentation, coding, and compliance policies before clinical use.