thanks for yous query.
Those spots on the posterior 1/3 rd of tongue are normally present in everybody. those are lingual tonsils
i.e. lymphatic aggregates in submucosa of tongue.
Some times during the attack of URTI they swollen and infected and causing throat pain and difficulty in swallowing.
You need to take antiseptic gargles and anti inflammatory drugs like tab Diclo
Add anti histaminics like Levocet.
Avoid cold & junk foods, smoking
Many thanks, take care, bye.