The rash

The rash is usually the only symptom of granuloma annulare, and most people with it are otherwise healthy. It may be slightly itchy, but it isn't usually painful.

There may be a number of rings that grow slowlyuntil they're about2.5-5cm (1-2 inches)across. They then becomeflatter and more purple in colour, before eventually fading.

In rare cases, the rash may spread all over the body, or there may be one or more firm lumps under the skin of the arms or legs (this is known as subcutaneous granuloma annulare).

Granuloma annulare usually disappears without treatment within two years, although it can sometimes last for many years and new rings may appear.It's not infectious or caused by Indoor allergy .

Content supplied by the NHS Website

Medically Reviewed by a doctor on 21 Dec 2018