thanks for your query, i have gone through your question, the styes and throat infection
could be because of bacterial infection...but the roof of the mouth and the tongue lesions looks like viral particularly herpes zoster
infection in that the lesion wont cross midline...or the lesions could be because of the fungal infection
where it produces reddish areas.. consult a oral physician for complete examination and proper diagnosis and management...
i hope my answer will help you..
Dr. Mahesh Kumar T.S