Has anyone experienced getting rough patches on the skin in various places from taking PM? I discovered some rough patches on my skin like small rash spots which make me think i'm possibly allergic to PM. Any ideas?

Can't say if you might be having a reaction, but it should be easy enough to figure it out. Go without any PM for a week or two and see if the rash goes away. Then restart your PM and if it comes back, you've pretty much figured it out.