Some white growth and red patches on the tongue.

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Hi I notice the red patches at the back of my tongue both sides and white growth on top of tongue.
I have this white thing for few months now and seen GP for this. She said she don't know what that is.

This red patches are new and noticed it 5 days ago. It's on both sides. Don't know if this red patches are some serious infection growth?
I am waiting for dentist appointment which is not until end of May.

Any thoughts here.