Dd, almost 2, has been a bit run down and lethargic lately though has been getting over a cold and cough. Today I noticed a white spot / ulcer (?) on the crease at the corner of her mouth but didn't think any more of it until tonight when I was brushing her teeth and noticed they have spread over her top and bottom lips. They are quite small (except for the one in the corner which is bigger) and don't look red round the edges like ulcers. They're very white and slightly raised. She's got no fever but is off her food, seems to have a bit of diarrhea and as I said seems a bit lethargic, a bit clingy and very easily frustrated.
Any ideas?