Yes, SKINHEAD is a Scrabble word!

Letter values in Scrabble US: S 1, K 5, I 1, N 1, H 4, E 1, A 1, D 2.

Is it a valid word?

SKINHEAD is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

a young person who belongs to a British or American group that shave their heads and gather at rock concerts or engage in white supremacist demonstrations