There are a number of reasons for the condition of hard lumps after soft tissue injuries, such as hematoma, scarring, infection and so on. 1. hematoma: hard lumps after soft tissue injuries may be due to hematoma, usually after absorption of hematoma can return to normal. 2. Scar hyperplasia: If the soft tissue injury is an open wound, it may be due to scar hyperplasia caused by the phenomenon of hard lumps. 3. Infection: If there is an infection after soft tissue injury, the infection will also lead to the phenomenon of hard lumps. There are many reasons that lead to hard lumps after soft tissue injuries, it is recommended that patients go to the hospital in a timely manner to improve the examination, in accordance with the doctor’s instructions to take standardized treatment, do not ignore the symptoms, take it lightly, so as not to cause adverse consequences.