What are eruptive vellus hair cysts (EVHS) and how are they treated?

Updated: Jul 29, 2019
  • Author: Julianne H Kuflik, MD; Chief Editor: Dirk M Elston, MD  more...
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Answer

The eruptive vellus hair cysts [6] manifest as flesh-colored papules found usually on the face, chest, neck, thighs, groin, buttocks, and axillae. They represent an anomaly of the vellus hair follicles and may be hereditary. Histopathology reveals a mid dermal epithelial cyst containing vellus hairs and keratinous material. These cysts may undergo spontaneous regression, form a connection to the epidermis, or undergo degradation with a resultant foreign body granulomatous formation. Treatment is often difficult. Incision and drainage of individual lesions carries the risk of subsequent scarring, and modalities such as carbon dioxide laser ablation are difficult to use over large surface areas. Topical retinoids and 12% lactic acid preparations have proven useful in some instances. For more information, see Eruptive Vellus Hair Cysts.


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