Disseminate and Recurrent Infundibular Folliculitis: Case Report and Literature Review.

We retrospectively analyzed the clinical data of 1 case of disseminate and recurrent infundibular folliculitis (DRIF) in our hospital and 31 cases of DRIF reported in previous domestic and international studies. There were 32 cases, including 22 males and 10 females, with a mean age of onset of 24.72 ± 13.68 years. Skin lesions were more likely to occur on the trunk and proximal extremities and may involve the face, neck, and genitals. Typical histopathology revealed mild thickening and spongy edema of the spinous layer, different degrees of pigmentation increase in the basal layer, and mild to moderate spongy edema and inflammatory cell infiltration (predominantly lymphocytes and neutrophils) in the infundibulum and around the hair follicle. DRIF is a chronic disease more prevalent in young men of African descent and individuals with Fitzpatrick skin types 4-6. This disease is diagnosed based on clinical features and histopathology and is preferentially treated with retinoids.