Hi..
As per your complain it seems that you are suffering from premature greying of hairs as greying of hairs before the age of thirty years is considered to be premature greying..
It is considered to be caused due to causes like
smoking,
nutritional deficiency but is generally genetic in origin..
I would suggest you to consult a Trichologist and get evaluated and he can do a thorough clinical evaluation and advise you medications that can replenish your nutritional deficiency as well as certain cease
hair fall..
-You can be advised latest treatment techniques for grey hairs like Para amino benzoic acid and also Calcium Pentothenate..
-Avoid smoking.
-You can be given nutritional supplements like containing
Vitamin B12, copper, zinc etc..
-Avoid direct exposure to sunlight.
-Take antioxidant supplements..
For itchy scalp you should get the cause ruled out for itching like infection,
allergy, side effect of dyes etc..
Hope I have answered your query. Let me know if I can assist you further.
Regards,
Dr. Honey Arora,
Dentist