Tongue diagnosis help? My tongue has a quite thick white coating at the moment which I know to be because I am currently sick with a virus. However, on the mid-right (my right) side of the edge of my tongue, there is a circular patch that is quite a pronounced red, with no coating at all. It is about 1 centimetre in diameter. Is this telling me that there is a problem with the organ that area of my tongue represents? I am generally not in good wellbeing and tend to get this circular patch everytime I get sick. My acupuncturist use to tell me which organs were represented by each area but I've forgotten. What interests me most is why this patch doesnt have the white coating?

Summarized question: What could be the cause of the red circular patch on my tongue?