Abstract
Case 1 : A 65-year-old man developed erythemas on his neck, chest, and abdomen, which were areas in which he used water-absorbing cooling towel. Patch test results indicated that he suffered from allergic contact dermatitis due to the methylchloroisothiazolinone (MCI) contained in the water-absorbing cooling towel, with no cross-reaction to methylisothiazolinone (MI) or 2-n-octyl-4-isothiazolin-3-one (OIT). Case 2 : A 53-year-old woman developed itchy erythemas on her face for four months. Patch test results indicated that she suffered from allergic contact dermatitis due to the MI contained in the cosmetic facial masks she often used, with cross-reaction to MCI and OIT. Case 3 : A 53-year-old woman developed itchy erythemas on her face for three months. After improvement of the facial dermatitis, the patient used a cosmetic facial mask, resulting in recurrence of facial dermatitis. Patch test results indicated that she suffered from allergic contact dermatitis due to the MI contained in cosmetic facial masks, and she showed a cross-reaction to MCI. Case 4 : A 60-year-old woman developed itchy erythemas on her face for four months. Patch test results indicated that she suffered from allergic contact dermatitis due to the MI contained in cosmetic facial masks and cosmetic lotion.
