Itchyness on inner thighs, buttocks and cheeks, scrotum, and shaft. Bumps, Lumps, redness

Ok im gonna be as detailed as possible. Ive been looking everywhere for an answer and havnt been able to find it. Im very sexually active. Hardly ever wear protection, a few weeks ago i noticed a couple bumps on my inner thigh. At first i thought it was a bug bite or 2 so i wasnt to worried. It was very itchy, but again nothing that worried me. thru out the next few weeks, it seemed to spread. Some of the bumps are big enuf that they are very visable, other bumps look like a razor burn bump, but i dont shave. It went from bad to worse when i started getting itching urges not only on my legs but on the bottom/inside my buttocks. i would itch so hard that it looked like the bumps would bleed, and scab over. They arnt leaking any types of fluid, but are uncontrolablly itchy. I have been losing alot of sleep over it. About 2 weeks ago, after taking a shower i examined my legs and on my scrotum found these pink lumps that didnt have any puss or any discharge, but when i scratched my legs i caught myself scratching my scrotum too. there are a few bumps on my scrotum a few on each side and underneath. They kinda feel like they have something inside of them but when i squeeze them nothing comes out. Ive been clean never had an std. About 1 week ago i noticed a small bump on the shaft of my penis too. Im not sure if its spreading to my penis or if it is an std. i started getting worried and went to see the doc. he examined it and told me that there is nothing i need to worry about. that its some form of ingrown hair. all i had to do is add some lotion to it and it should clear up. Since then ive noticed a couple more bumps on the shaft of my penis. Im really worried that i might have caught something. also from then to now, the itching has gotten so much worse. i scratch and scratch. i know im not supposed to but its uncontrolable. I try putting powder, ive been using Ice to numb my thighs but its not helping. recently withing the past week ive started really getting itchy place almost all over my body. Places such as my elbows, knees, armpits, neck, and the bottom of my back. i just want it to be gone and figure out what it is. If Anyone have any suggestions. And if anyone is going thru the same thing and knows what it is please feel free to help me out. Im thinking about going in and getting it looked at again. There really isnt any pain until i itch for so long that it tears away the skin. please if anyone knows anything leave me a message.