What Do Itchy Rashes On The Body Indicate?

hello.. i have had a rash for over four years, i am looking at all my meds to see side effects. my rash is very itchy, bleeds easily when i scratch, is all over my body but most often by where bone meets skin like ankle knee elbow, etc. dermatologists just tell me it is dry skin and i disagree with that. my last one that became apparent, itched and i scratched it was in my lower head under hair. certainly not where it would be considered dry skin. it is so painful, connected maybe to nerve and muscle. my blotch on my lower left leg is about three inches by two and pain by just touching or hitting it. itches all the time. i had surgery for skin cancer on right leg lower section and they now are just as itchy as my problem itches aread. I take, Amlodipine losartan torsemide metoprolol crestor paroxetine and two nebulizer med, Albuterol Ipratropium and Budesonide end of statement. my computer is not working right now because of a virus. i am at someone else s computer. my normal e mail address is YYYY@YYYY