Respected ,I am traveling in train just now one of co passenger is having totally red rashes and like old wounds one his Rig leg below knee part .he is wearing shorts unfortunately that rash parts and old wounds directly touched to my left hand above the arm. That rashes are very red blood is not visible but that are looked like blood as well as wound. My left hand arms are clean and I don't have any rashes but just black type of skin .does hiv spread or any allergies spreads like this situations. Please help me sir.