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Staph infection

Also called Staphylococcal infection, Staphylococcus aureus, or MRSA

Staph infections are caused by staphylococcus bacteria, which many people carry harmlessly on their skin or in their nose. If they get into the body, for example through a cut, they can cause infections. Most affect the skin, such as boils, impetigo or cellulitis, but they can sometimes spread to the blood, bones, joints or heart. MRSA is a type that is resistant to some antibiotics.

Last updated Nov 9, 2026

What it is

Minor skin infections often get better by themselves or with antibiotic cream. Abscesses may need draining.

More serious infections need antibiotic tablets or treatment in hospital. Good hand hygiene and keeping wounds clean help prevent them.

Common signs

  • A painful, red, swollen area of skin
  • Boils or abscesses
  • Crusty sores
  • Pus
  • A high temperature

How it is usually diagnosed

  • Looking at the skin
  • A swab of the infected area
  • Blood tests if the infection may have spread

Records worth keeping

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

  • Swab and culture results
  • GP or hospital notes
  • Prescriptions
  • MRSA screening results

Questions to ask your doctor

  • Do I need antibiotics?
  • Is this MRSA?
  • How can I stop it spreading to others?

When to get help right away

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

  • A high temperature with shivering, confusion, or redness spreading quickly: call 112

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

Related conditions

Skin abscessA painful lump filled with pus, caused by a bacterial infection under the skin. Larger ones usually need draining.ImpetigoA common, contagious skin infection causing sores that burst and leave golden crusts. It is usually treated with a cream.CellulitisA bacterial infection of the deeper layers of the skin that makes it red, hot, swollen and painful. It needs antibiotics.SepsisA life-threatening reaction to an infection, where the body starts to damage its own organs. It is an emergency that needs treatment fast.