the red spot you mentioned is symptomatic or not ? are you having any fever? its not apthos ulcer because it dont involve keratinised surfaces. either it can be traumatic injury
from some tooth or it can be gingivostomatitis
if such spots are numerous on your gums and tongue along with fever. or it can be just proliferation of your papillae. you can use oroheal or mucopain , if its traumatic injury. if theirs fever along with numerous such spots, then take acyclovir
5 times a day along with lot of cold
water. for better diagnosis, get yourself clinically examined.
wishing you speedy recovery
with best regards