Aphthous ulcers known as -
Ans. is 'a' i.e., Canker SoresAphahous ulcers o Also known as Canker Soreso These are superficial Ulcerations of oral mucosa.o The lesions may be Single or multiple.o Ulceration is surrounded by an erythematous halo and is Covered by a thin exudate.
Canker sores
Marjolin's ulcer
Curling's ulcer
Cushing ulcers