Osmosis video - Erythema multiforme

Erythema multiforme is an immune-mediated skin condition that typically causes red, itchy patches on the skin. It can also affect the mucous membranes of the mouth and genitals; in some cases, the patches can blister and form lesions. Erythema multiforme is commonly triggered by a Mycoplasma or Herpes simplex virus infection. Some drugs can also cause it, such as penicillins, ciprofloxacin, and anticonvulsants such as carbamazepine.