Inverse psoriasis erupts as smooth, shiny, red patches in skin folds. Other psoriasis flare-ups elsewhere at the same time are fairly common, according to the National Psoriasis Foundation.
Inverse psoriasis targets the armpits, the folds around the genitals, under the breasts and in other skin folds on the body, according to the National Psoriasis Foundation. The inflammation may be triggered by a fungal infection and worsens with friction and perspiration, according to Mayo Clinic.
Inverse psoriasis lesions may produce painful, bleeding fissures in the inflamed areas in skin folds. The discomfort may cause some people to experience intimacy problems, according to WebMD.