Eruptive vellus hair cysts, also known as Favre-Racouchot syndrome, is a rare skin condition characterized by the sudden onset of multiple, small, white or yellow cysts on the trunk and extremities. The cysts typically range in size from 1 to 3 millimeters and are filled with a clear or milky fluid. They are usually asymptomatic, but some people may experience mild itching or discomfort.
The exact cause of eruptive vellus hair cysts is unknown, but it is thought to be related to a blockage of the hair follicles. The condition is most common in young adults, but it can occur at any age. There is no cure for eruptive vellus hair cysts, but the cysts usually resolve on their own within a few months.




