I've thought about your question a little more. If he/she asks in a concerned way - because they're taught in school to look for symptoms in relation to a person's health - bald spots etc could indicate a health problem. So if the hairdresser expresses concern, you can either tell the truth or say "yeah I've been losing some hair and I should ask my doctor'. It's not like they'll know right away you're the one who's pulling it. There are other reasons for hair breakage and bald spots. Don't worry about them judging you Amanda.