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The immortal bard asks "What's in a name?" but if any one heeded him, that one certainly was not a dermatologist, as from time immemorial the investigators in this department of medical science have clogged up the literature with names to the point of redundancy. It is nevertheless necessary to have a proper cognomen for a definite entity, be that a state or disease, and this title refers to that malady sometimes known as "Darier's disease," "psorospermosis," etc.
A full description can be found in all the well-known text-books on dermatology; suffice it to say in this instance that the disease is a keratosis, follicular, as a rule, but not necessarily so.
It was first described in 1889, independently, by White of Boston and Darier of Paris. The latter author pointed out histologically some small, round, double contoured bodies, which he termed "psorosperms," hence the name "psorospermosis;" these he thought
TRIMBLE WB. OBSERVATIONS ON KERATOSIS FOLLICULARIS: WITH REPORT OF FIVE CASES IN THE SAME FAMILY. JAMA. 1912;LIX(8):604–607. doi:10.1001/jama.1912.04270080286006
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