Which acupuncture point should be pressed to resolve blood stasis when the veins under the tongue are black?

Darkening of the sublingual complex is usually caused by blood stasis. You can press Blood Sea, Diaphragm Yu, Hegu and other acupoints to activate blood circulation and eliminate blood stasis, but the effect varies from person to person, and it is recommended to treat under the guidance of a professional doctor.
1. Blood Sea is in the anterior femoral area, 2 inches above the medial end of the patellar base, at the elevation of the medial head of the quadriceps muscle. It is a key point for treating blood evidence (non-physiological bleeding disorders), and is mainly used for treating irregular menstruation, dysmenorrhea, dysmenorrhea, medial knee and femur (inner thigh) pain, addiction rash, eczema, and dengtu (an acute infectious disease in which the skin is seen to be red as if it has been coated with pigment) and other disorders.
2. Diaphragm Yu is located on the back, at the lower edge of the spinous process of the 7th thoracic vertebra, 1.5 inches away from the back center line. It is the blood meeting point of the eight meeting points, and is used to treat vomiting, hiccups, choking, chest fullness (chest fullness and discomfort), dystocia (pain in the area of the ribs and coats of arms), gastric pain, epilepsy, coughing up blood, vomiting blood, anemia, and spinal pain, among other illnesses.
3. Hegu is the original point of Yangming meridian, located at the mouth of Guankou, which is a major point for regulating the body’s qi, through regulating qi to regulate and activate blood circulation, and to promote menstruation and relieve pain, and it is mainly used for treating fever, headache, redness and swelling of the eyes, epistaxis (bleeding from the nose), haematochezia, sore throat, toothache, menstrual pain, menstrual occlusion, stagnant labor and other diseases.
It is recommended to consult a doctor in time, under the guidance of a professional doctor to identify the evidence of treatment, acupuncture operation must be carried out by a professional acupuncturist, not self-operation, so as not to cause damage to the organism.