Hi thanks for contacting health care magic..... Don t directly think about cancer..... You have pharyngitis infection of throat... Food debris or pus accumulation can led pus accumulation... Take amoxyclav like antibiotic for five days... Continue salt water gargles in hot water... If needed dilute iodine gargles can be done. For inflammation relief antihistaminic drug can be taken.... Steam inhalation also can be taken. Hot water taken..... If still no benefit posterior pharynx swab taken ... In cancer growth can be seen.... Here you have no chance of cancer.... Avoid smoking.... With keeping this in mind consult physician. Take care