I wonder if there's some medicine I can take as my skin is very oily especially my scalp and face? Or is it a diet thing and just avoid oily food? Which I did already but it seems not working?

OILY SKIN FACE SCALP. WASH YOUR FACE WITH AN ACNE WASH. SHAMPOO YOUR HEAD ONCE DAILY WITH A TAR SHAMPOO. CUT DOWN ON ALL NUTS, CHOCOLATE, AND DAIRY PRODUCTS FOR TWO OR THREE WEEKS. SEE WHAT HAPPENS. IF NO BETTER, PLEASE SEE A DERMATOLOGIST. BEST LUCK.