Help! Dark skin blotches just appeared!

Brittany

Hello! I'm worried about my little sister, in the past two weeks she's had several dark misshapen blotches appear on her arms and legs!

Her dermatologist can't see her till late October!!!!😨

Possibly important info!

She is a vegan

She takes prescriptions for her severe acne: spironolactone

And vyvanse for her ADD