Scaly, embarrassing skin on chin. Please help (desperate)

Hi, I'm a 20 y/o woman who recently started getting some scaly skin on my chin. It started out as a small patchy piece of skin in the center of my chin. Then I started getting little bumps on the right side of my chin, which I thought was acne. But now the dry patch and bumps both turned into scales that randomly itch and get red (when I eat or move my mouth) or during sleeping. The scales seems to be getting bigger and falling off, but now I see small bumps again on the left side of my chin that will eventually probably turn into the same scale. I researched perioral, allergic, irritant dermatitis and none of them show the severe scaling I have. Exfoliating/picking makes it worse.

My derm is no help. I have no allergies, eat healthy, and don't put anything synthetic on my face. I started brushing with water only in fear it was my toothpaste but that didn't help. Tweet