A haematoma is a collection or pooling of blood in an area of the body, creating a clotted lump.
Fracture haematoma or muscle haematoma?
The initial haematoma in a fracture carries to the site of injury those important substances that trigger healing. In the muscle, the haematoma essentially does the same thing but the clot may persist as a blood filled lump which might need to be removed.
The haematoma and its role in bone healing. Schell H, Duda GN, Peters A, Tsitsilonis S, Johnson A and Schmidt-Bleek K. J Exp Orthop. 2017 Dec; 4: 5.
Management approaches to acute muscular strain and hematoma in National level soccer players: a report of two cases. Brynne E. Stainsby BE, Piper SL and Robert Gringmuth R. J Can Chiropr Assoc. 2012 Dec; 56(4): 262–268.