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I would like to thank Dr Tkach for his interest in my article "Lichen Planus Subtropicus" (LPS) (Archives 112:1251-1253, 1976). The answer to Dr Tkach's question is no. The following reasons explain why this entity was not discoid lupus erythematosus (DLE): (1) The erythema of acute, active DLE was absent. (2) The lesions healed without scarring. (3) The infiltrate was confined to the upper part of the dermis. (4) There was no follicular plugging.The clinical appearance of LPS is confusing if you are not familiar with this entity. The color is very characteristic, and the distribution is so peculiar that nobody will miss the diagnosis if you have seen one or two cases. Immunofluorescence is a good test if you have it, but unfortunately I did not. As we all know, DLE has been diagnosed many years before immunofluorescence was available.
Dilaimy MS. Lichen Planus Subtropicus or Discoid Lupus Erythematosus?-Reply. Arch Dermatol. 1977;113(12):1729. doi:10.1001/archderm.1977.01640120097027