Hello,
It can be due to fungal infection of the hair or lice hair. The symptoms of Tinea Capitis (fungal infection) include a dry itchy scalp, scaling, crusting, inflamed nodules, hair loss and tender enlarged lymph nodes on the neck.
I suggest you to get it evaluated from a dermatologist.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your dermatologist. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
Black dot tinea(Fungus) of hair is commoner in children than in adults. A dermatologist will be able to pinpont this presumable diagnosis.