Erythema nodosum is swollen fat under the skin causing red bumps and patches. It usually goes away by itself but it can be a sign of something serious.

Check if you've got erythema nodosum

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DR P. MARAZZI/SCIENCE PHOTO LIBRARY

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BSIP SA / Alamy Stock Photo

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Hercules Robinson / Alamy Stock Photo

You may also have flu-like symptoms, such as:

• a high temperature of 38C or more
• tiredness
• joint and muscle pain

If you're not sure it's erythema nodosum

Check other types of lumps.

How you can ease the pain yourself

• take painkillers, like ibuprofen
• rest with your feet raised on a pillow
• apply a cool wet compress, like a damp cloth

The bumps and patches last about two weeks before fading like a bruise.

They usually heal completely on their own within six weeks without leaving a scar.

A pharmacist can help with erythema nodosum

If you're in pain, your pharmacist can recommend:

• stronger painkillers
• supportive bandages or stockings
• steroid creams

Your pharmacist may also suggest you see your GP.

Treatment from a GP

Your GP should be able to tell if you have erythema nodosum by looking at your bumps and patches.

If your GP thinks your medication might be causing your erythema nodosum, you may be advised to stop taking it. Don't stop taking your medication without asking your GP first.

You GP might suggest some tests if your erythema nodosum:

• could be a sign of something more serious
• hasn't cleared within six weeks

Causes of erythema nodosum

Erythema nodosum can be caused by lots of things but often the cause is not known.

Common causes include:

• Crohn's disease
• ulcerative colitis
• a bad reaction to some medicines
• sarcoidosis
• tuberculosis
• pneumonia
• streptococcal infection