Acquired Reactive Perforating Collagenosis

Acquired reactive perforating collagenosis (ARPC) is commonly recognized as an unusual skin reaction to superficial trauma that is observed in patients with a certain genetic predisposition or underlying diseases, such as diabetes mellitus or renal diseases. We present the unusual case of a 55-year-old female diabetic patient with numerous characteristic dome-shaped nodules, which consisted of central umbilication containing firm keratotic plugs.