[Comment on the contribution by L. Weber: Yersinia exanthema].

Lutz Weber has described Yersinia exanthema, a distinctive dermatological disorder characterized by three or all of the following signs: 1. A typical erythema-multiforme-like eruption, particularly on the neck, shoulders, and arms, 2. Erythema nodosum, 3. Conjunctivitis, particularly on the nasal side of the conjunctiva, 4. Arthralgia. The case presented here concerns a patient who satisfied all of the criteria for Yersinia exanthema and in whom no infection could be demonstrated.