Sore throat due to acne in back of throat wall

Patient: I have white spot back of my throat wall like cyst filled pimple about 1mm I went to doctor he said it is food particle i said then remove he said leave it is this really a food particle round shape like acne on skin, I dont think that it is food particle becouse now after 1 month it hurts

Symptoms: Mild pain Can eat and talk normaly