When cupping, the skin will produce various reactions (mainly changes in color and shape) to the stimulation of cupping, which is called "cupping spot". Common pot spots are flush, purple or purple-black ecchymosis, small punctate purple-red rash, and often accompanied by different degrees of heat pain. These changes in the skin belong to the therapeutic effect of cupping therapy, which can last for one to several days. Generally speaking, the pot spot of disease-free patients has no obvious change.

Different Hu points have different clinical significance.

Pot spots are water vapor, blisters or edema, indicating that the patient is wet and cold or cold and wet and causes disease;

Pot spots are red or black-red blisters, indicating the pathological reaction of long-term illness and blood stasis;

Pot spots are purple-red or purple-black, and there is no fever caused by blood stasis, which indicates that the patient has cold coagulation and blood stasis, with different degrees of severity;

Pot spots are purple or purple-black, or there is a rash, which is slightly painful to touch and has fever all over the body, suggesting that patients have heat toxicity;

Tiny itching or dermatoglyphics in the jar indicate that the patient has rheumatism;

The skin color of the canned food has not changed, and it feels tepid, indicating that the patient has deficiency-cold syndrome.

After cupping, if there is no sealing or sealing, it will disappear immediately after cupping and return to normal color, indicating that the condition is still mild; If you don't return for several days in a row, it often means that you have been ill for a long time and need more treatment. With the improvement of the disease, the color will also decrease, which can indicate the recurrence of the disease.