Table 1.

Types of Recurrent Aphthous Stomatitis*
	Minor	Major	Herpetiform
Gender predilection:	M=F	M=F	F > M (usually)
Age of onset (years):	5–19	10–19	20–29
Number of ulcers:	1–5	1–10	10–100
Size of ulcers (mm):	<10	>10	1–2 (larger if coalesced)
Duration (days);	4–14	>30	<30
Recurrence rate (months):	1–4	<1	<1
Site predilection:	Lips, cheeks, tongue, floor of mouth	Lips, cheeks, tongue, palate, pharynx	Lips, cheeks, tongue, pharynx, palate, gingiva, floor of mouth
Permanent scarring:	Unusual	Common	Unusual

^*Adapted from: Porter SR, Scully C, Pedersen A. Recurrent aphthous stomatitis. Crit Rev Oral Biol Med. 1998;9(3):306–321.