Instances of epithelioma arising on areas of skin affected by psoriasis are unusual, and for this reason the following case is reported.
REPORT OF A CASE
History.—A man aged 45, an engineer, acquired psoriasis in 1922. The disease has been active ever since except for three months' remission in 1930 during a trip to Canada. In 1938 the patient discovered that arsenic medication controlled the eruption, and he had been taking solution of potassium arsenite U.S.P. (liquor arsenicalis B.P.), 3 to 10 minims (0.19 to 0.62 cc.) three times daily, with only an occasional discontinuance of the drug for a month at a time. The patient's daughter also suffers from psoriasis.
In 1942 the patient noted that his palms and soles were becoming "crusted and thickened," that his skin was becoming darker and that an ulcer was developing on a large patch of psoriasis situated on the lower left
HANNAY PW. SQUAMOUS CELL EPITHELIOMA AND PSORIASIS. Arch Derm Syphilol. 1949;60(3):430–434. doi:10.1001/archderm.1949.01530030126015
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