A 79-year-old woman with leukomelanoderma due to meticrane was treated. She had been prescribed meticrane for 1.5 years, for hypertension. A leukomelanodermic lesion developed on the sun-exposed areas of her skin, of a one year duration. At the time of admission, no photosensitivity to UVB and UVA was found. After oral administration of meticrane 300 mg/day for 3 days, UVA (2.7∼16.2 J/cm
2) was irradiated and an erythemal reaction developed at the areas of 10.8 and 16.2 J/cm
2 irradiation. This UVA photosensitivity persisted for 5 weeks. A similar reaction was induced by trichlormethiazide, a drug which she had not been taken. In this case, a photoallergic reaction was suspected because even a small dose of meticrane induced UVA photosensitivity and a cross reaction between meticrane and trichlormethiazide was evident.
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