Skin abscess

Also called Abscess or Boil

A skin abscess is a painful, swollen lump filled with pus that forms under the skin. It is usually caused by a bacterial infection, often entering through a small cut, a hair follicle or a sweat gland. Abscesses can appear anywhere, but are common in the armpits, groin, buttocks and around the base of the spine.

Last updated Nov 9, 2026

What it is

Small abscesses sometimes drain by themselves. Larger ones usually need to be cut open and drained by a doctor.

Antibiotics may also be needed if the infection is spreading. Do not try to squeeze or burst an abscess yourself.

Common signs

  • A painful, swollen lump
  • Red or darker skin around the lump
  • Warmth over the area
  • Pus coming out
  • A high temperature

How it is usually diagnosed

  • Looking at the lump
  • Sometimes a swab of the pus

Records worth keeping

Keeping these together makes each appointment easier, especially when you see a new doctor:

  • GP or surgical notes
  • Swab results
  • Prescriptions
  • Wound care notes

Questions to ask your doctor

  • Does it need to be drained?
  • Do I need antibiotics?
  • How should I care for the wound?

When to get help right away

Call 112 or go to the nearest emergency department if you have:

  • Redness spreading quickly, a high temperature with shivering, or an abscess on the face: get urgent help the same day

This page is general information. It is not a diagnosis and does not replace a doctor who knows your history. Medfold keeps your records organised; it does not interpret them.

Sources