<prompt> Aphthous ulcers are known as -Canker soresMarjolins ulcerCurlings ulcerCushing ulcers  <response>: Aphthous ulcers Also known as Canker SoresThese are superficial Ulcerations of the oral mucosa.The lesions may be Single or multiple.Ulceration is surrounded by an erythematous halo and is Covered by a thin exudate. 