Your scalp is the skin under the hair on your head. He smoothed his hair back over his scalp
To remove the part of the head from where the hair grows, by brutal act or accident
the skin that covers the top of the head; "they wanted to take his scalp as a trophy" remove the scalp of; "The enemies were scalped" sell illegally, as on the black market
To trade on the market for small gains Scalping normally involves buying and selling a position quickly, usually within the same day, hour or even a few minutes