<s>[INST] .hi my name is yani, i recently found a red circular patch on my tongue in the middle towards the back, it dosent hurt, and its more red than my real tongue, what could this be, im worried [/INST] Thanks for your query, I have gone through your query. The red circular patch in the middle of the tongue can be because of the median rhomboid glossies, usually occurs secondary to fungal infection like candidiasis, or stress or nutritional deficiency or secondary to immunodeficiency like diabetes. Consult an oral physician and get it evaluated. If it is a fungal infection, it can be treated with topical antifungal agents like clotrimazole mouth paint(candid mouth paint). Get your complete blood investigations to rule out other immunodeficiency conditions. I hope my answer will help you, take care. </s>