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Clinical Notes, New Instruments and Techniques
July 1958

Unilateral Keratosis Follicularis: Report of a Case Clinically Resembling Nevus Unius Lateris

Author Affiliations

Phoenix, Ariz.

From the Department of Dermatology, 3700th USAF Hospital, Lackland Air Force Base, San Antonio, Texas.

AMA Arch Derm. 1958;78(1):95-96. doi:10.1001/archderm.1958.01560070099018

Keratosis follicularis is a congenital skin disorder which begins usually in childhood and is characterized by keratotic follicular papules which later tend to become papillomatous. Sites of predilection are the head, face, extremities, chest, and inguinogenital regions. Generally, this is a symmetrical dermatosis, but unilateral involvement can occur.1-4 The following case report illustrates this rare atypical distribution which was so striking that the clinical impression of several dermatologists who examined the patient was verrucous epidermal nevus (nevus unius lateris).

Report of Case

An 18-year-old Caucasian youth presented himself to the dermatology clinic because of a pruritic papular eruption on the right side of the trunk and the right lower extremity. He stated that he had first noted clusters of small papules on the right hemithorax 14 months previously. Similar lesions appeared two and one-half weeks later on the right flank, the right thigh, and the right

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