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To the Editor.—
Dr Dilaimy reported 20 unusual cases that he classified as lichen planus subtropicus (LPS) (Archives 112:1251-1253, 1976). The features of these cases sound and look very similar to discoid lupus erythematosus (DLE). The conditions of these cases were worse during sunny months and better during winter months. Sunscreens were protective. Topical and intralesional steroids were helpful. Lesions were in sun-exposed areas. The histologic features of liquefactive degeneration or the basal layer and the band-like infiltrate could be seen in DLE also. Actinic keratoses may occasionally show lichenoid features. Dr Dilaimy did not report direct immunofluorescence studies or antinuclear antibody. Could these cases of LPS actually be DLE? Readers are advised that in view of The Copyright Revision Act of 1976, all Letters to the Editor submitted for publication must contain on the transmittal letter the following language: "The person(s) undersigned hereby grant the American Medical Association permission
Tkach JR. Lichen Planus Subtropicus or Discoid Lupus Erythematosus? Arch Dermatol. 1977;113(12):1729. doi:10.1001/archderm.1977.01640120097026
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