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November 1992

Congenital Trichoid Keratosis of the Scalp

Author Affiliations

Dermatology Division Department of Medicine; Pediatric Department Ramathibodi Hospital Mahidol University Rama 6 Rd Bangkok 10400, Thailand

Arch Dermatol. 1992;128(11):1549-1550. doi:10.1001/archderm.1992.01680210129026

To the Editor.—  A case of congenital multiple horns on the scalp, which disappeared spontaneously within few weeks, is reported. These horns contained shadow cells with the presence of trichohyalinlike granules and granular layers in the underlying epidermis. The term congenital trichoid keratosis is proposed, since these horns tend to differentiate toward the inner root sheath and hair cortex.

Report of a Case.—  A Thai female infant was born at full term by normal labor. Her 24-year-old mother developed pruritic, urticarial papules and plaques 2 weeks before parturition; these papules and plaques subsided spontaneously after delivery. The mother was otherwise healthy and had an uneventful pregnancy. At the time of birth, the infant had a self-limited subnormal temperature. The vertex of scalp showed a slightly erythematous hypotrichotic patch (diameter, 1.5 cm). Over 10 short, white, hornlike columns were loosely stuck on the patch (Fig 1). The length of each column

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