Erythema multiforme

Erythema multiforme is a skin condition that can be caused by an infection or some medicines. It usually gets better on its own in 2 to 4 weeks.

The main symptom of erythema multiforme is a rash.

Sometimes you can get the rash inside your mouth or on your lips, eyes, anus or genitals. This can be painful.

Other symptoms

You may also have other symptoms such as:

  • a high temperature
  • headache
  • body aches and pains
  • feeling generally unwell

See a GP if:

  • you have symptoms of erythema multiforme
  • erythema multiforme keeps coming back

It may be possible to treat the cause of your symptoms.

Ask for an urgent GP appointment or get help from NHS 111 if:

You think you have erythema multiforme and:

  • the rash is inside your mouth or on your lips, eyes, anus or genitals
  • the rash is painful
  • you're finding it difficult to eat or pee
  • you have a high temperature or body aches and pain
  • the rash appeared after your started taking a new medicine

You can call 111 or get help from 111 online.

Call 999 or go to A&E if:

  • you have a rash and the skin is red, swollen, blistered or peeling – redness may be harder to see on brown and black skin
  • you're wheezing
  • you get tightness in your chest or throat
  • you have trouble breathing or talking
  • your mouth, face, lips, tongue or throat start swelling

These may be signs of a serious reaction and may need immediate treatment in hospital.

Find your nearest A&E

Erythema multiforme usually gets better on its own in 2 to 4 weeks.

Sometimes, you may need:

  • moisturisers or steroid creams to speed up recovery and help ease symptoms like itching
  • treatment for the infection that's causing it, such as antiviral medicine for a virus

Erythema multiforme is usually caused by an infection, such as the herpes simplex virus (which also causes cold sores) or a bacteria that causes lung conditions like pneumonia.

It can sometimes be caused by some vaccines or medicines such as non-steroidal anti-inflammatory drugs (NSAIDs), antibiotics, statins and medicines for epilepsy.

If it's caused by a medicine, you usually need to stop taking it. But do not stop taking any medicines without talking to a doctor first.