Sofa dermatitis caused by methylisothiazolinone in a leather‐care product

Conflict of interest: The authors declare no conflict of interests. 0.5% and triamcinolone acetonide 0.1% in a non-ionic ointment base, but, 1 month later, the dermatitis worsened and a new biopsy was performed, which again showed spongiotic dermatitis. The patient underwent patch testing, which resulted in positive reactions to chromium and colophonium, but these were not considered to be relevant. The lesions cleared following the use of intramuscular corticosteroids. However, in November 2011 and in the spring of 2012, the skin lesions recurred. These were then treated with ultraviolet B therapy and betamethasone dipropionate 0.05%, but with little improvement. In July 2012, the skin lesions became much worse (except on the face), and, when the patient