20M, red rough patch in mouth

I (20) male,non smoker, 5.8 height, have a low blood platelet count 27 currently based on last week's blood test results, all my other markers are normal ranges, white blood cells and red blood cells are normal. Doctors could never determine why my blood platelets are so low, my body breaks them down quicker than it makes new ones. Have developed a rough patch in my right cheek a long time ago, I thought it was scare tissue due to bitting my cheek sometimes when eating back in the day, but now I see it has become a red patch now. There is another small sore deeper into my mouth on the arch that links to the reflex small tongue, this small sore caught my attention cause it was hurting but then I saw how red the rough patch in my cheek was. Here is the google drive link to the image of the red patch in my mouth. Any advise please https://drive.google.com/file/d/11_x9TlvlqdfQGK6pixzdzExd0CqJWrit/view?usp=drivesdk