Yes, ALOPECIA is a Scrabble word!

Letter values in Scrabble US: A 1, L 1, O 1, P 3, E 1, C 3, I 1, A 1.

Is it a valid word?

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

loss of hair (especially on the head) or loss of wool or feathers; in humans it can result from heredity or hormonal imbalance or certain diseases or drugs and treatments (chemotherapy for cancer)