Hello, It is very hard to make a diagnosis based on the description that you gave in your post but judging by the cause you listed I’d say this is a common case of penis lymphocele. Lymphocele is a collection of lymph that accumulates in pockets or tanks that you see as blisters beneath your skin. Lymph is drainage liquid; actually it is liquid commonly found in intercellular spaces all around the body. It is drained into the bloodstream by special channels called lymph vessels. Lymphocele appear when drainage of lymph is blocked, in that case lymph accumulates in blisters and stays there until drained in some other way. Penis lymphocele are not dangerous, they are not infectious and they usually disappear on their own. If they appear after having sex or after masturbation you should drain them yourself by applying pressure on the blister. To make them go away permanently you should avoid having sex or masturbating for a couple of weeks. If they still continue to be a problem for you, you should address this matter to your GP or your urologist. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Jagadish Golabavi