<prompt> Aphthous ulcers known as -Canker soresMarjolins ulcerCurlings ulcerCushing ulcers  <response>: 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. 