Fixed drug eruption in a mother and her son.

Two cases of fixed drug eruption, occurring in a mother and son, are presented. The eruption in the mother occurred after she ingested dimenhydrinate or acetylsalicylic acid and in the son after ingestion of either of the above drugs or with "junk" food (cheese crisps). Apart from the drugs, anxiety was found to be an essential factor in the manifestation of the mother's disease. A genetic predisposition would seem to link these cases.