Suggest Treatment For Spreading Skin Infection And Vitiligo

Question: hi i have been given antibiotics for a skin bacteria inection under around my neck and chin area. I was not told what this was but since doing research i believe it is impetigo. The rash has since spread to my bum cheeks and was in my groin and quite painful but i think the antibiotics sorted this. I have finished the course of treatment and is still on my bum cheeks and since then i have noticed random dry yellow skin in different areas of my body, one small area on my nose and one small area in my groin V line and was very painful in that area but not to press or release and then a small yellow crust with a small red circle around it. I am a regular crystal meth and Gbl user and am trying to quickly prepare for a crash so that I can boost my immune system up. My immune system has been a mess for a quite some time due to a dramatic amount of series of unfortunate events causing major stress levels to increase and my vitiligo to spread. The trouble is is that I cannot afford to take any time off work as I am self-employed and have already eaten through savings from the bad luck I have had in recent time so i cannot crash for too long so can you suggest anything that might help. I hope you can help and understand my rant, thank you