Aphthous stomatitis

Recurrent aphthous stomatitis (RAS) or canker sore is characterized by the repeated formation of benign and non-contagious mouth ulcers.
Ulcers occur periodically and heal completely between attacks
Individual ulcers last about 7–10 days, and ulceration episodes occur 3–6 times per year.
The severe forms may be debilitating, even causing weight loss due to malnutrition.
Very common, affecting about 20% of the general population
Thrush, Mouth Candidiasis are its inter related entities.

They have no detectable systemic symptoms or signs
Prodromal sensations such as burning, itching, or stinging, which may precede the appearance of any lesion by some hours
Pain, which is often out of proportion to the extent of the ulceration and is worsened by physical contact, especially with certain foods and drinks
Pain is worst in the days immediately following the initial formation of the ulcer, and then recedes as healing progresses.
Speaking, chewing and swallowing can be uncomfortable due to lesions
Aphthous ulcers typically begin as erythematous macules which develop into ulcers that are covered with a yellow-grey fibrinous membrane that can be scraped away.
A reddish "halo" surrounds the ulcer. The size, number, location, healing time, and periodicity between episodes of ulcer formation are all dependent upon the subtype of aphthous stomatitis.
RAS is thought to be multifactorial

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