A 5 cm lump on the edge of pubic hair can be seen in folliculitis, sebaceous cysts, inguinal hernia, etc. 1. Folliculitis: when the hair follicle is infected by bacteria and causes inflammation, pimples will form in the hair follicle and its surrounding tissues, manifesting as pain and itching. If the folliculitis occurs near the edge of the pubic hair, a lump of about 5 centimeters can be formed in severe cases. 2. Sebaceous cysts: Sebaceous cysts are cysts that are formed when the sebum secreted by the sebaceous glands fails to drain from the hair follicles and collects in the sebaceous glands. Usually there are no obvious symptoms, and they can be the size of an egg or even larger. The presence of a 5 cm lump on the edge of the pubic hair does not exclude the possibility of sebaceous cysts. 3. inguinal hernia: inguinal is located in the lower abdomen and thigh medial junction, when there is a defect in the groin, the abdominal cavity of the tissues, organs can be protruding outward through the defect to form a mass, it is inguinal hernia, usually in the standing, coughing, carrying heavy objects aggravated. A 5-centimeter mass at the edge of the pubic hair may also be an inguinal hernia. A 5-centimeter lump on the edge of pubic hair may also be due to other causes, and it is recommended that you visit a hospital promptly to find out the nature of the lump and treat it.