Hi welcome to Health care magic forum. Pimples are a universal problem, you didn't mention your age if still in teen age it might be genetic. try to find out whether any one in your family have gray hair in small age. Causes of gray hair in others is malnutrition
, mental stress
It appears that the gel you have used didn't suit you. it is allergic to you, causing and caused allergic reaction
like itching and dandruf. So i advise you to discontinue the gel .
I advise you to consult a cosmetic dermatologist
or a trichology clinic for diagnosis of the internal problem, and treatment.
Besides i advise you some diet recommendations as Take more of green leafy vegetables, pulses, sprouts, egg, chicken, meat, milk, fruits, juices, and dry fruits. Which increases blood, general health, resistance of body to such things, and stamina to lead comfartable life.
Also try to follow some diversion procedures as yoga
, reading books, and hearing music, which reduce the mental tensions. Wishing for a quick recovery and thanks for calling.