If it is located on the tongue, it is mostly considered as petechiae, which is caused by blood stasis in the body and deposited on the tongue. It is often accompanied by petechiae, petechiae on the skin or local tingling. Women may have symptoms of low menstrual flow and blood clots, and it is recommended to give treatment to activate blood circulation and eliminate blood stasis by taking Blood Mansions and Stasis Oral Liquid or internally taking blood activating drugs such as peach kernel, safflower, panax notoginseng and Chuanxiong. If the black spot is located on the tongue, consider whether it is related to the consumption of black or sauce-colored food, and if it disappears after local wiping, it is mostly related to such coloring. If this is ruled out, black moss should be considered, and the cause is mostly heat and fluid injury in the body, which should be treated by clearing heat and generating fluid, with drugs such as Shengdi, Lily, Sha Shen, Mai Dong, etc.