As I understand you son have less hair on the head which needs a proper diagnosis. few of the most commonest cause are
Nutrition deficiency :- That is due to less amount of intake of vitamins and minerals, for which give him lot of green leafy vegetables and fruits.
Fungal infection of the head (Scalp) for which you need to diagnose and treat it.
Alopecia areata is condition in which there is sudden lose of hair in patches, which is due to immune condition of the body.
Endocrine problems like hypothyroidism that need to be confirmed by Diagnosis by blood test.
I request you to kindly consult a skin specialist who will help you to come to proper diagnosis and advise you appropriate treatment.
Hope this answer your query.
Doctor’s Team Modasta.
Disclaimer: The medical information in this answer is provided as an information resource only. Please consult your health care provider before making any healthcare decisions or for guidance about a specific medical condition.
Hello Monsan, May be It is hormonal imbalance or genetic disorders.I suggest that better to consult dermatology they will advice and give better treatment.If you have any health issues http://howtocure.com/?s=hair&utm_source=offpage&utm_medium=organic&utm_campaign=forum%20participation