This paper has a threefold purpose: (1) to corroborate the frequent occurrence of a topographical variant of psoriasis described by Senear and Caro,1 (2) to ascertain whether the involved sites matched any of the characteristic patterns depicted by Waldbott and Shea in their classification of patterns on the hands following exposure to and contact with various substances and (3) to determine the relationship of trauma (Koebner phenomenon) as a causal factor of this localized type of psoriasis.
Senear and Caro1 reported an entity of nonpustular psoriasis characterized by the presence of sharply outlined patches on the extensor surfaces of the joints, sides of the fingers, finger tips, or palms. A characteristic saucer-shaped dell was noted in the palmar lesion. The dry scale of the lesions was typically silvery on scraping. There was a tendency toward fissuring, and, consequently, painful finger tips might be noted. The biopsy was diagnostic
SAMITZ MH, ALBOM JJ. PALMAR PSORIASIS. AMA Arch Derm Syphilol. 1951;64(2):199–204. doi:10.1001/archderm.1951.01570080083014
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