To the Editor.—
Pityriasis rosea is a common self-limiting disease that affects children and young adults. Topical therapy has not been effective in promoting healing of the lesions or reducing the pruritus.1 Ultraviolet light has been mentioned as helpful, but there is only one study substantiating such claims,2 and the authors did not evaluate the effect on pruritus. This report describes one patient in whom lesions developed during the summer, when she had prolonged exposure to sunlight, and three others in whom the onset was in the fall when they were tanned but no longer exposed to sunlight. There was marked sparing of the tanned skin only in the patient who was exposed to the sun during the time the lesions were developing, suggesting a direct beneficial effect of light.
Report of Cases.—
A 30-year-old woman complained of a nonpruritic eruption that had been spreading for several days.
Baden HP, Provan J. Sunlight and Pityriasis Rosea. Arch Dermatol. 1977;113(3):377-378. doi:10.1001/archderm.1977.01640030123031