Does taking ivermectin 12 mg cause skin rashes? Kind of ringworm over inner thighs and around neck area ? Also, I have used derma roller which I suspect was clean (it's my personal one though). Does using unclean dermaroller cause tinea facei or ring worms. I have also been using Hair4U F solution, does this solution cause tinea facei or ringworm ? Any advise is greatly appreciated, thanks.