4. DEFINITION It is a most common disease charecterized by the development of painful,recurring,solitary or multiple ulcerations of the oral mucosa. manju
11. APPEARANCE-begins as a single or multiple superficial erosions covered by greyish – white removable fibrinopurulent membrane encircled by erythematous halo.
26. APPEARANCE- extend deeper and may present as crater-like ulcers with rolled margins which are indurated on palpation because of underlying fibrosis. manju