Wu××, male, 9 years old History: 1 week ago had a fever and sore throat, after the fever subsided purpura appeared on both lower extremities, sometimes want to scratch, appetite is not fragrant, short urine, stool is still possible. On examination, the purpura was symmetrically distributed on both lower extremities, with bright red color and different sizes, red tongue and thin yellow coating. Laboratory examination: blood routine, urine routine is normal. Diagnosis: allergic purpura, evidence of wind-heat injury, treatment: dispel wind and evil, clear heat and cool blood, prescription: self-prepared formula, cicada molasses 6, fangfeng 6, jingyinhua 12, forsythia 9, raw groundnut 9, red peony 6, peony bark 6, raw rice kernel 9, licorice 3, 7 doses (decoction, twice a day), second diagnosis: purpura basically subside, sometimes itchy skin, stomach and appetite as usual, the two stools are still regulated, the condition is stable, and then the original method to consolidate. The above formula remove the forsythia and red peony, and add the ground bark 6, x 7 post. Note: As children are infantile Yin and Yang, their Qi and blood are not yet full, and they are not strong outside. The six qi are all from the fire, and are stored in the skin, hair and muscles. The wind-heat, foreign qi and the qi-blood, the heat hurts the blood channels, forcing the blood to travel, overflowing outside the veins and seeping under the skin, resulting in purpura. The treatment should be to disperse the wind and disperse the evil, clear the heat and cool the blood, in which cicada molasses and anti-feng relieve the wind, honeysuckle and forsythia clear the heat, raw earth, red peony and danpi clear the heat and cool the blood to eliminate the spots, raw rice kernel dissolve the dampness and percolate, and licorice harmonize the medicines. The identification of the evidence and the prescription fit, heat clearing and dampness, blood to the meridians, after the medicine purpura is seen to calm.