Nodular Acne

There are four types of severe acne, one of which is nodular acne. Cysts are relatively uncommon in acne; however, this form of severe acne is characterized by cysts, which may measure several centimeters in diameter. The nodular cyst of acne is not a true cyst—an abnormal dilatation of a normal skin structure. Acne cysts are nodules of inflammation. The cysts may arise from a papular or nodular acne lesion, or occasionally from a type of cyst that develops in the outer layer of the skin—a type of cyst not usually associated with acne. A cyst may appear to be filled with thick, yellow pus-like fluid. Information obtained from its original SOURCE.