 [ Symptoms ] i have a mouth ulcer and sore throat i burnt my mouth on hot food about 4 days ago i have a few painful ulcers at the roof of my mouth one large one has a white coating i have a sore throat and woke with a white coating on my tongue this morning could i have thrush on top on the burns in my mouth [ Disease ] injecting steroids into one or two local areas of inflammation allows doctors to deliver a high dose of medication directly to the problem area when doctors give steroids by mouth or intravenously they cannot be sure an adequate amount of the steroid will eventually reach the problem area