I have an aphthous ulcer in the back of my throat, any tips to ease the pain? What should I gargle with?

Mixture of… Hydrogen peroxide, warm salt water (saline), & alcohol-based mouthwash will soothe & help heal ulcer. Or can use otc prep glyoxide. Be sure not to swallow mixture. If aphthous ulcer doesn't improve, fp/ent can treat with silver nitrate stick.