SOLAR URTICARIA IN AN INFANT

A 2-year-old girl presented with a history of an erythematous rash whi ch occurred immediately after exposure to sunlight and had been a prob lem since birth. Extensive laboratory investigations to exclude genoph otodermatoses, photosensitivity secondary to metabolic disorders and p hotoaggravated dermatoses were negative. Monochromator irradiation pho totesting demonstrated immediate erythematous flares to all ultraviole t B (UVB), UVA and visible wavelengths up to 500 nm. A diagnosis of so lar urticaria was made and she responded to loratidine 10 mg daily. We believe this is the first report of solar urticaria, confirmed by pho totesting with a monochromator so early in life.