Actinic comedonal plaque.
Solitary plaques developed on the sun-exposed and damaged skin of five elderly, fair-skinned individuals. The lesions, erythematous to bluish confluent nodules and plaques with a cribriform appearance and comedone-like structures, presented a distinctive histologic picture of dilated, keratin-filled follicles within a matrix of amorphous, damaged collagen. We believe these cases demonstrate a distinct entity within the realm of actinic dermatoses, for which the name "actinic comedonal plaque" seems appropriate.
D000368:Aged; D005260:Female; D006801:Humans; D007642:Keratosis / Q000209:etiology / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D010787:Photosensitivity Disorders / Q000473:pathology*; D012867:Skin / Q000528:radiation effects; D013472:Sunlight; D014466:Ultraviolet Rays / Q000009:adverse effects*