Hi, welcome to the forum, you need a detailed evaluation. First thing need
to be ruled out is oropharyngeal candidiasis or
thrush. Candidiasis, it can present in many ways (white plaque, erythematous and beefy appearance).
Candida is yeast which is responsible for this. But this should be confirmed by KOH preparation and microscopy which will show the candidial growth. This usually occurs in immunocompromised condition like diabetes, steroid therapy or HIV.