Hello there.... Crohns disease
is associated with oral ulcerations. Medications used to treat such conditions usually cause ulcerations....Do not keep middling the ulcer as that might aggravate. Use topical anesthetic
to get over pain...you must surely be taking vitamin supplements..if not do take them... ulcer in the oral cavity is like any other injury
over the body...to get healed it takes 4- 5 days... the topical anesthetic such as dentogel/mucopain would give you transient relief from pain.