I’ve Been Smokng Crack Cocaine, And Latley Ive Had Sores

I’ve been smokng crack cocaine, and latley ive had sores on my legs and arms that are horrible in apperance. Im also suffering extreme back pain. Ive been reading that some of these drugs are cut with Levamisole ..? I am very concerned about whats been happening to my body...can you please give me your opinion ??