[Toxic dermatitis caused by pseudoephedrine: apropos of a case].

Allergy to pseusoephedrine seems to be rare and has been described as responsible of urticaria, contact dermatitis, fixed non-pigmenting erythema or pseudoscarlatina. We report the case of a male patient who presented a recurrent erythema after administration of different treatments including pseudoephedrine. A cutaneous biopsy was compatible with erythema multiform. Patch tests confirmed the diagnosis of allergy to pseudoephedrine but resulted in a reappearance of symptoms.