Question: how long do aphthous ulcers last?
Answer: Minor aphthous ulcers (MiAUs) are usually self-limiting, with the usual duration being about 10-14 days without any active treatment. Major aphthous ulcers (MjAUs) can last up to about a month. A third type of RAS, the herpetiform ulcers, are devastating, lasting from 10 days to about 100 days.