Reactive perforating collagenosis is a rare, familial, nonpuritic skin disorder characterized by papules that grow in a diameter of 4 to 6mm and develop a central area of

umbilication A skin condition, also known as cutaneous condition, is any medical condition that affects the integumentary system—the organ system that encloses the body and includes skin, nails, and related muscle and glands. The major function of this sy ...

to which

keratinous Keratin () is one of a family of structural fibrous proteins also known as ''scleroproteins''. Alpha-keratin (α-keratin) is a type of keratin found in vertebrates. It is the key structural material making up scales, hair, nails, feathers, horn ...

material is lodged.James, William; Berger, Timothy; Elston, Dirk (2005). ''Andrews' Diseases of the Skin: Clinical Dermatology''. (10th ed.). Saunders. Page 510. . The cause of reactive perforating collagenosis is unknown.

Clinical Features

Inherited form

Keratotic papules measuring 1 to 6 mm develop on the extensor surface of the hands, the elbows, and the knees following superficial trauma. These lesions are painless. They appear as pin-sized lesions that grow to a papule of about 6mm in the following 3–5 weeks. They undergo spontaneous resolution in about 6–8 weeks leaving residual scarring. Lesions may recur throughout life. Cold weather is one of the factors known to trigger recurrences.

Acquired form

In this form, keratotic papules develop on the trunk and extremities. These are commonly associated with pruritus. Lesions may or may not be related to superficial trauma.

References

External links

{{Cutaneous ketatosis, ulcer, atrophy, and necrobiosis Abnormalities of dermal fibrous and elastic tissue Conditions of the skin appendages

Clinical Features

Inherited form

Acquired form

See also

References

External links