Related Questions

How long does rash associated with erythema multiforme last?

1-3 weeks. It is, of course, variable based on each patient. Em is most often self-limited. Mild cases can resolve in 1-2 weeks but more advanced cases can take longer to resolve. Read more...

My 9 y/o son was diagnosis w/erythema multiforme. He takes xyzal (levocetirizine) to keep the rash minimal but this has lasted 3 mo. Does EM last this long?

Allergy? Erythema multiforme may be from an allergy to medications, or a viral infection which lasts 2-6 weeks if it is mild. If it's worse by now you may want to see your doctor again. Here is a handout on EM: http://www.wikidoc.org/index.php/Erythema_multiforme_%28patient_information%29. Read more...