Swollen leg a big bag is commonly due to the following reasons: 1st, mosquito bites, when bitten by mosquitoes, local allergic reactions will occur, there will be lumps, you can locally rub alkaline substances, such as baking soda water, toothpaste, including mosquito repellent drugs to reduce pain and swelling. No. 2, swollen lymph nodes, often caused by bacterial or viral infections, can be relieved by drinking more warm water appropriately and taking oral medications to clear heat and lower fire, such as Shuang Huang Lian Oral Liquid and Jin Yin Hua Oral Liquid to relieve swelling and pain. 3rd, sebaceous cysts, which are caused by the blockage of hair follicles, need to be surgically removed to get a cure. Localized hematoma, often caused by trauma, can be applied locally with heat to promote the absorption of the hematoma. 5th, vascular thrombosis, need to go to the hospital to check the ultrasound to clarify, in short, if there is swelling, need to promptly go to the hospital to clarify the cause.