My friend has developed a bumpy rash all over his stomach , hands, legs, and back. They are red bumps and constantly itch . He doesn t recall eating or coming in contact with anything unusual. He is a regular marijuana smoker, and this is the last thing we can think we can think it can be. Is it possible for this to happen? Nothing else unsual is happening aside from the rash and bumps he has developed. Do you have any idea what this could be? Thank you.