In order to study the flare-up of contact allergy, 35 patients with a contact allergy to gold were given an intramuscular injection of 10 mg gold sodium thiomalate, i.e. the anti-rheumatic drug Myocrisin. Clinical reactions comprised an eczematous flare-up of previously positive patch tests to gold and of a previous dermatitis, which occurred in 80% and 26%, respectively; a toxicoderma-like ras...