Men with purple pimples on the outer skin of the testicles can be considered folliculitis, scrotal eczema, scabies and small hemangiomas and other conditions, it is recommended to further to the hospital for examination to clarify the cause of the disease. 1. Folliculitis: due to the extensive distribution of hair follicles and sweat glands in the scrotum area, so if you usually do not pay attention to personal hygiene, sweating cleaning is not timely, etc. may cause folliculitis, etc., and may appear red, mauve pimples and other manifestations. 2. Scrotal eczema: if there is an abnormal immune function, excessive scratching, underwear friction and emotional fluctuations and other reasons may cause scrotal eczema, the scrotum area may appear mauve pimples, blisters and so on. 3. Scabies: If you have contacted the skin and clothing of a scabies mite patient, it may cause the mites to parasitize the skin, and mauve pimples may appear. In addition, the above symptoms can not be ruled out due to warts and varicose veins caused by small hemangiomas and other diseases, so patients are advised to go to the regular hospital in time for further examination, to clarify the cause of timely treatment.