Why does it blister after moxibustion?

This is a normal phenomenon and a factor of detoxification in the body. It doesn't matter, you can continue moxibustion.

Blisters indicate that the moisture in the body is heavy. If the blister is colorless, it means it is cold. If they are yellow, it means that there is heat stagnation. If the blisters are bloody, it means that there is more moisture in the body.

Moxibustion is itchy, indicating that there is wind evil. In fact, moxibustion is a good thing, which can help you to dispel wind, dispel cold and dehumidify ~ ~ I wish you health.