Hello, Since you are sexually active without protection before, it can be due to Syphilis, diagnosed by Blisters appear as the first symptoms of primary syphilis. They usually disappear on their own with time, but remains in the body. first blisters on penis appear, important to seek medical help. Molluscum contagiosum - small, painless bumps. Non sexually transmitted infections are Acne, Fordyce spots - which develop when skin s pores are clogged with natural oil, called sebum, sweat, dead skin, it can also cause infection. Skin tag – it s normal, happens in age advances. Ingrown hair which is painful can leads to infection, needs medical management. Pemphigus – its autoimmune disease can be diagnosed by Blood investigation. Hope I have answered your query. Let me know if I can assist you further. Take care Regards, Dr S.R.Raveendran, Sexologist