Yes, ULCERATION is a Scrabble word!

Letter values in Scrabble US: U 1, L 1, C 3, E 1, R 1, A 1, T 1, I 1, O 1, N 1.

Is it a valid word?

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

a circumscribed inflammatory and often suppurating lesion on the skin or an internal mucous surface resulting in necrosis of tissue
the process of ulcer formation; the process of becoming ulcerated