It hurst, it's kinda like a stye but worst and its not in my eye its in my body. help me please.

It started about 4 yrs ago and since then it's gotten worst. I have no idea what it's called. At first it pops up, look like a pimple on your skin but after a couple of days it grows bigger, and it hurts like hell if you touch it. Even when your not touching it, you can feel the pain. But right smack on the middle of it is a white spot, and if you peel it, its pus comming out. you can't really touch it because it hurts sooo much, but the only way to get rid of it is to squeeze out all the pus and then after a couple of days it will start to die out, BUT then a NEW one comes out somewhere eles and you have to do the same thing over and over again. the pus is very contagious. I put alcohol on it so it doesnt spread, but i think that that thing is too powerful that it just pop up anywhere, its been popping up on my face a lot, and it hurts, the pus inside of it gets sooo big. I dont know what to do. i dont know what it is and how i get rid it. I eat advil so it numbs the pain so i can sleep and work. but it doesnt kill the "thing" Im sick of it, and it hurts soo much. i have no idea how it started it all the sudden popped on my arm. its gotten worst now. I'm most of the time stressed, i have no major dseases. I do have skin rashes. Dry skin, excezma. never had any treatment on this "thing". Hopefully you can help tell me what it is and how i can treat it before i go crazy. it annoys me a lot and its kinda like a stye but worst and its not in my eye its in my body. help me please.