A hard lump on the lip after a good knock may be formed due to the proliferation of subcutaneous scar tissue around the lip, which can be relieved by medication and daily care. If there is no obvious redness, swelling and exudate on the surface, it usually does not need special treatment. 1. Daily care: After 24 hours of trauma, hot compresses can be used to accelerate swelling and absorption and promote blood circulation. 2. Medication: Topical use of scar removing medication such as cumulonimbus cream to prevent scar proliferation and promote hematoma absorption. If the above treatments are not effective, and a foreign body is found in the healing wound, surgery is also needed to remove the foreign body. It is recommended to dispose of the wound under the guidance of a doctor, and if it persists for one month and does not subside, go to the hospital for consultation. During the period of wound recovery, pay attention to eat more vegetables and fruits containing vitamins, do not eat spicy and stimulating food, do not smoke and drink.