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A girl, aged 9 months, had an eruption which her mother said began at the age of 3 weeks. There had been remissions and exacerbations from that time until the child was brought to me. At the time that I first saw the patient, there was a characteristic eruption of lichen planus on the arms, forearms and hands, on the back and on the legs and knees. The lesions were the typical eruption of a rather active lichen planus. Some of the papules occurred as isolated lesions; others were arranged in lines and others in patches up to the size of a coin or larger. On the back and arms, the lesions were intensely violaceous, and receding lesions were deeply pigmented. The eruption was pruritic; the mucous membranes were not involved, and there was no febrile disturbance. The only peculiarity about the lesions were their large size and their appearance
William Allen Pusey. LICHEN PLANUS IN AN INFANT LESS THAN SIX MONTHS OLD. Arch Derm Syphilol. 1929;19(4):671–672. doi:10.1001/archderm.1929.02380220140008