I recently had sex, and not getting a lot. I didn't use a condom or lubricant, but felt there was enough natural lubricant to plough ahead. I felt pain after a while of penetration and stopped. The following day my head was red raw and itchy. I've since had nearly 2 weeks of puss under my foreskin needing twice daily cleaning, and at times extreme itchiness. Swelling and redness on the head and outside top of the penis head has gone down, redness and pussy-ness under foreskin has only lightened slightly and is still itchy. Have I over extended my for skin? (Never and issue before) or is it an STI?