Hello, Thank you for writing to HCM, Masturbation is for satisfy yourself sexually when you dont have any partner. But its good if use in some manners like no excessiveness as you are doing it. Other most thing which could be in mind that you should masturbate in some manner like not to hurt your penis too much. Because normally what happens that when you are totally involved in sex than you should not having too much presence of mind that time it might be possibility of injury. I had gone through your query and would like to suggest you that it could be infection of some types which occurs many time as you mentioned. So, i would like to advice you that you may concern a good doctor they may suggest you better after checking you physically. Hope you will find it helpful. Thanks & Regards, Dr. Gaurav Prajapati