Hello,
For the hair fall, causes could be due to stress, fungal infections, alopecia aereata, hormonal imbalance (overproduction of dihydrotestosterone and thyroid hormones irregularities),malnutrition, telogen effluvium and sebum plugs on skin.
I would suggest you to consult a dermatologist and get these possibilities evaluated.
I hope it helps. Take care and regards.
If its simple androgenetic alopecia there is nothing much we can do unless he wants to go for hair transplantation. Minoxidil can help and so can taking finasteride orally. But you need to discuss with a dermatologist before you start them.
Regards
Dr.Sasi Attili
www.onlineskinspecialist.com