There are both serious and not so serious causes of rashes like the ones you are describing. I think the first step is to sort out whether the rash is serious, and your primary care doctor
can help you do this. In particular I am concerned about your history of drug abuse and I particularly want to know if you have ever engaged in injection drug use. This is because injection drug use puts you at much higher risk of infection with hepatitis C and HIV among other things, both of which can be associated with severe skin rashes
. Therefore, I highly recommended getting checked out for these if you have this history.
In the absence of a serious medical problem, then it is likely that you are just dealing with a bad case of eczema
, which is a very common cause of skin inflammation, redness, itching, and cracking. The mainstay of treating eczema is moisturize your skin very well. It is best to use a thick, greasy moisturizer such as a petroleum jelly product. You also need to avoid scratching, and an over the counter steroid cream might help.
I suggest seeing your primary care doctor to help you sort all this out.