Linear Hyperkeratotic Papules on the Forehead.

Verruca plana, caused by human papilloma virus, is frequently seen in children and young adults. The lesions are usually distributed in photo-exposed areas like face, neck, and dorsum of the hands. Contiguous warts may coalesce to form larger plaque. Linear arrangement of the papules at the sites of scratching (koebnerization) is characteristic. Common differential diagnoses of this condition include acne (polymorphic lesion, presence of comedone, common in acne-prone area), molluscum contagiosum (pearly, skin-colored papules with central umbilication), syringoma (small, firm skin-coloured, translucent papules, common on the lower eyelids), and adenoma sebaceum (pink, dark brown, or skin-colored telangiectatic papules). FIG. 1 Multiple skin-colored, hyperkeratotic flat-topped papules over the forehead.