According to the picture provided, the redness that you notice on the palate in proximity of the roots of the maxillary left third molar appears to be part of the normal mucosa. however at times, there is variation in colour of musosa from one part to another, not necessarily due to any disorder or condition. If you have been constantly touching the specified area with your tongue or finger after you noticed the redness, that can also contribute to the difference in colour. Please consult a dentist to thoroughly get the area examined for any changes in texture, colour or size or even pain, if it continues to be a problem.
Next Steps
Avoid frictional irritation of the area