red patches in throat

Well for the past week i have noticed red patches in the back of my throat. the patches arn't connected and there flat and about the size of a dime and i was wondering if throat irritation or sinus infection could cause something like this. i was holding off on going to the doctor but if it doesn't clear i have to go. I am 24 yr old female and don't smoke and rarely drink would it be possible for me to have oral cancer at such a young age?

Yes it would be possible.  I know of people in the late teens that have oral cancer.  The rule of thumb is, if a sore doesn't clear up in two weeks see a doctor.