title: Reactive perforating collagenosis and phototraumatism.
abstract: Two pairs of siblings are reported suffering from reactive perforating collagenosis. The clinical features were recurrent crusted papules with a central keratinaceous plug. The plug was sometimes encircled by a narrow yellowish ring and a wider red ring, giving the appearance of a cockade. Lesions recurred spontaneously or were provoked by superficial injury to sun-exposed skin (phototraumatism). There were no other changes in the general health of these patients.
mesh_terms: D000293:Adolescent; D003095:Collagen Diseases / Q000209:etiology / Q000235:genetics* / Q000473:pathology; D005260:Female; D006801:Humans; D008297:Male; D012867:Skin / Q000473:pathology; D012871:Skin Diseases / Q000209:etiology / Q000235:genetics* / Q000473:pathology; D013472:Sunlight / Q000009:adverse effects*; D013577:Syndrome