I have been using cocaine for about a year, like 2 or 3 times per month. The next day of the used of cocaine, I presented a bad skin rash all over my body, like a mosquito bites, it is so itchy, especially in my head or my back, Why I have this reaction? I know it is bad for me, I want to stop because I don't want to loose my family. My boyfriend offered to me and he always want to use when we get out for fun. I don't have any contact to get the drug,so I was thinking to stop this relationship because I don't want to get involve in this kind of things again.