Three possibilities: 1. When you are angry, a taste bud on your tongue will be swollen and painful. Because it is very small, there is nothing unusual in the first few days, but after a long time, you will find a small protrusion that is a little red. Guilin sanjin watermelon frost spray is generally used, and the effect is OK. Of course, it won't get better immediately after spraying, but it will take a few days. Fire in the human body is generally reflected in the oral cavity, such as heavy tongue coating, long aphtha, long red pimples on the tongue and so on. Then eat less things that get angry. Oranges, mangoes, durians and lychees are easy to get angry. It is best to eat pitaya, pear, apple, carambola, mangosteen, grapefruit, strawberry, loquat, tomato (slightly cold), watermelon, banana, kiwi, melon, grapefruit, orange, persimmon, coconut water, mulberry and so on. 2. You really bit your tongue, or the bones that eat fish or meat stick to your tongue, which will cause inflammation due to injury. Just take some anti-inflammatory drug Niuhuang Jiedu tablets or something. I used to have an oral wound, and I used that band-aid, you know? It's a small pill that can be attached to the affected area. I remember there seems to be mineralocorticoid in it, which is very useful for wound healing. 3. Bacteria are infected. It turns out that when we eat it, there are many bacteria in it. If you have a small wound on your tongue and it is infected, that's not good. Take a rest and go to the hospital. Don't be afraid of medical treatment. Many times it is considered as a small problem, and it will become troublesome if it is not handled in time.