Talk to Andrologist on Thin Facial Hairs

Seeking advice for a 28 year old male with no medical history, normal weight and height, but thin/sparse facial hair on the cheeks and mustache. Hairs below the chin (on the neck) are much better. Father and paternal side cousins also have thin facial hairs on the cheeks. Also did the testosterone level check a few years back which was quite good (on the high end of the normal range). Please guide if it's due to genetics (which I strongly believe is) and if it can be cured? Which doctor/specialist to consult with?