1)how to use derma roller for hair growth on head. 2) I can use same derma roller for face glowing. 3) After using derma roller on head , how to maintain , Means Shampoo , oil i can use or not 4) After using derma roller on head and face, we need apply or required any creams or any oil or any medicine. 5) Derma roller how many days once use on head and face . 6) how to select 0.5 / 1.0/1.5 Please provide all the details individually. Jayananda sagar