DermNet provides Google Translate, a free machine translation service. Note that this may not provide an exact translation in all languages
Author: Assoc Prof Patrick Emanuel, Dermatopathologist, Auckland, New Zealand, 2013.
Comedones are follicular retention cysts which may open directly to the surface (open comedone or “blackhead”) or have a blocked surface (closed comedone or “whitehead”).
Sections of open comedones show massive follicular dilation (figure 1). The dilated follicles are filled with keratin (figure 2). These may be filled with cellular debris and/or inflammatory cells. Closed comedones do not show a patent follicular channel to the surface (figure 3).
None are needed.
Solar comedones and Favre-Racouchot – Show massive dermal elastosis.
© 2019 DermNet New Zealand Trust.
DermNet NZ does not provide an online consultation service. If you have any concerns with your skin or its treatment, see a dermatologist for advice.