Liar, the highest and fastest drug absorption rate is under the tongue, nasal mucosa and inhalation, and then the skin absorption rate in other places is very low, and the absorption rate in places with rich sweat glands in the chest and back is slightly better. The sole of the foot is also the main part of perspiration, but the absorption rate is very low. It may be that the sweat on the sole of the foot reacts with the substance on the foot patch. People with high level of Chinese medicine are in the hospital. Don't trust roadside stalls and TV advertisements.