I would avoid citing any specific medical condition in case someone in your family has a medical background or knows about that condition for whatever reason. If I were you I’d shave the facial hair and not mention it unless someone asks. Honestly, I feel like most people would avoid saying anything because it could be rude. If they do, pull out something along the lines of “oh yeah, my doctor said it’s something to do with my hormones, I don’t remember exactly” and change the subject.

Idk if this is better but sometimes birth control pills can cause facial hair growth