Yes, CREASING is a Scrabble word!

Letter values in Scrabble US: C 3, R 1, E 1, A 1, S 1, I 1, N 1, G 2.

Is it a valid word?

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

make wrinkles or creases on a smooth surface; make a pressed, folded or wrinkled line in
make wrinkled or creased
scrape gently
become wrinkled or crumpled or creased

Also: scrunch up.