Hii , Welcome To HCM & Thanks For Asking Your Query Here The skin Of Penis , foreskin, and scrotum have very sensitive skin that can become inflamed and swollen after an injury injuries to the penis can include scratches and Bites, knocks, burns. Sometimes contact with creams and lotions that cause a local allergic reaction can cause painful swelling. as you were very sexually active it is very likely that foreskin of your shaft get injured due to any of above reasons in most cases you dont need to be circumcised , you can follow these instructions -Avoid sexual contact until you feel free of pain and swelling -Wear loose fitting Underwear and cloths -Do not apply any creams, lotions or homemade remedies to any wounds. -Do not wrap anything around the penis or scrotum, such as a bandage, tourniquet or sticky tape. -An ice pack may relieve swelling, but it should not be placed directly against the skin. Try wrapping a bag of frozen peas in a cloth, such as a clean tea towel, and mould this around the swollen area. - You can Take over the counter pain killer like ibuprofen for relieving pain -if your symptoms persist even after 7 days i would strongly suggest you to see a Doctor to rule out any underlying medical condition including infections and specially a Sexually transmitted disease (STD) I hope it help Thanks & Get well Soon