Hard lumps after varicose vein surgery may be caused by subcutaneous bruising, clots formed by blood in the varicose veins, which are not completely absorbed. Hard lumps after varicose vein surgery are mostly due to bleeding from the blood vessel trauma during or after surgery, resulting in the formation of blood clots and bruising. Due to the shallow anatomical location of the veins, they may be palpable on the surface of the body, appearing as hard lumps, accompanied by redness and swelling of the skin, with a higher temperature and pain when touched. Some may be accompanied by infection and fever. In addition, after varicose vein surgery, an elastic bandage may be used, which will gradually drive the blood to an area where a hard knot will form. They may be used as prescribed by your doctor. Diosmin tablets, horse chestnut seed extract tablets, and mucopolysaccharide polysulfate cream to relieve clinical symptoms. If there are hard lumps after varicose vein surgery, it is recommended to communicate with the doctor, use medications as prescribed and intervene in the treatment.