Hi i think it is aphtous stomatitis or leukoplakia
Apthous stomatitis due to stress induced.or vitamin b-complex deficiency
.it is usually associated with ulcers over the tongue.it may occur due to chronic antibiotic intake.
Leukoplakia is a fungal infection
it can it normal fungal infection or indication of immunodeficiency
syndrome like hiv.syphilis or hbsag.in present case it is leukoplakia as flakes of skin are coming.
It can be cured with nizral 400 mg once daily for one weeknand application of candid mouth paaint over the lesions