Acquired reactive perforating collagenosis

Unraveling the Enigma of Perforating Itches: A Comprehensive Report of Reactive Perforating Collagenosis in Three Patients

Reactive perforating collagenosis (RPC) is a rare dermatosis where dermal connective tissue erupts through the epidermis, resulting in diverse clinical manifestations such as umbilicated papules with crusting and excoriated nodules with central puncta. Associated with systemic disorders like diabetes mellitus, chronic kidney diseases, and autoimmune conditions, RPC's pathogenesis involves abnormal collagen metabolism, immune dysfunction, genetic predisposition, and environmental triggers. Histopathological examination reveals vertically oriented shallow cup-shaped invaginations containing degenerated collagen fibers, aiding diagnosis. Treatment includes managing underlying causes and utilizing options like topical corticoids, retinoids, and phototherapy, with a possibility of spontaneous regression and recurrence. This case report highlights the significance of considering RPC in patients with characteristic skin lesions and severe itching, emphasizing early recognition and accurate diagnosis to optimize patient care. Continued research and collaboration are crucial for improving outcomes in individuals affected by RPC.

Perforating Gout: Expanding the Differential for Transepidermal Elimination

Perforating dermatoses are dermatologic disorders with transepidermal elimination (TE) of dermal substances. While TE is typically associated with collagen and elastin, it can also occur as a secondary event in other processes, and it is important to keep a broad differential. We present a case of perforating tophaceous gout, which underscores the need for a thoughtful approach to perforating disorders. An updated review of recent literature is also presented.

Acquired Reactive Perforating Collagenosis: A Case Report

Reactive perforating collagenosis (RPC) is a rare form of dermatosis. It forms with perforating folliculitis, Kyrle's disease, and serpiginous perforating elastosis, which is a group of perforating dermatosis. RPC can be hereditary with autosomal dominant transmission or it can be acquired, which is usually observed in diabetics with chronic renal failure. Here we report a new observation in a 72-year-old woman treated by phototherapy with a favorable outcome