What do ulcers look like?

[Guest guest]

My 18 month old daughter had been fevering recurrently since very young- had

periodic fevers with no mouth sores, diagnosed with Periodic Fevers of Unknown

Origin this summer. Anyway, she just got sick again last week, had all the

symptoms of another episode (trouble sleeping, eating, irratable)but temp only

made it to 100 - 101. But she started drooling profusely which was weird, and I

looked in her mouth saw that she had a dime-size red circular ulcer on her

tongue which was very painful to her. Took her to the pediatricain, he did not

know if it was caused from a virus or maybe she is beginning to get ulcers due

to the periodic fever syndrome evolving. He basically said there is nothing I

could do but just wait until it goes away.

So my question: What do the ulcers from look like? How are they different

from hand, foot and mouth virus ulcers or other virus sores?

Thanks,