What is it about?
Transepidermal elimination disorders (TEE) are characterized by elimination of altered dermal substances through perforating skin lesions. Reactive perforating collagenosis (RPC) is a rare type of TEE in which collagen is extruded through the epidermis.
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Why is it important?
RPC most commonly involves extensor aspect of hands, forearms, legs and face. However, less commonly affected sites include trunk, scalp and buttocks. Involvement of perineum is an interesting clinical presentation in the present case, which has so far not been reported in the literature.
Perspectives
Superficial trauma in the form of scratching due to pruritus could have triggered the development of RPC in the present case. In addition, as Koebner’s phenomenon, friction from edges of undergarments, the trauma encountered while sitting and contact with cold ground could be other contributory factors for the development of RPC in such unusual location.
Dr Arunprasath Palanisamy
Read the Original
This page is a summary of: An uncommon disease at an unusual site in a female child, Indian Journal of Dermatology, January 2015, Medknow,
DOI: 10.4103/0019-5154.169170.
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