about a week ago my lady and I had sex (unprotected) and well, there was a lot of friction and dryness on her part. The next day I noticed these lumps under the skin pretty much under and around the top half of my foreskin. They are more noticable while I'm erect and are more aggitating during that time. The feeling if I can describe is like cartilage.
Hi, If you can be sure it's not STI and believe your partner then we can think of other non-STI. - 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 - Rough masturbation/sex - Bullous impetigo – bacterial infection due to bad hygiene or use of public pools, towels - 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. Regards, Dr. S.R.Raveendran, Sexologist