Hi...
There are a lot of triggering factors for the ulcers on tonsil food, allergies,stress, bacterial infections, hormones, nutritional deficiencies.
The triggering factor for your ulcers is hot and spicy food as you have mentioned, so it will time and again keep coming unless you avoid those particular food which are triggering it.
And you don’t need to worry about cancer just consult a dentist once, you’ll be relieved.
Since these ulcers are unapproachable with hands ointment won’t help but mouthwashes will definitely help you.
Next Steps
Consult a dentist online/offline
Health Tips
Do warm saline rinses 2-3 times a day.