What should you know about MCL injury bruising?

The MCL lies along the inner knee, and a sudden stretch can damage small blood vessels as well as ligament fibres. Blood may spread through nearby tissues, so discolouration can appear below or around the original sore spot and may change shade as it clears. Bruising can accompany tenderness and swelling, but some ligament injuries have little visible bruising. A clinician uses the injury story, examination of stability and movement, and sometimes imaging to understand what has happened.

Avoid football, running and twisting while the knee is painful or unstable. Rest the specific aggravating activity, use a wrapped cold pack if it helps, and elevate the leg after activity. Do not massage a freshly injured area or use bruising alone to decide that sport is safe. A clinician may recommend [Knee Bracing](/treatments/non-surgical-orthopedics/knee-bracing/) and [Physiotherapy](/treatments/physiotherapy-and-rehabilitation/physiotherapy/) for progressive movement and strength. A [Return-to-Sport Programme](/treatments/physiotherapy-and-rehabilitation/return-to-sport-programme/) can guide later drills.

Arrange assessment if bruising follows a strong impact, spreads quickly, or appears with marked swelling, instability or difficulty bearing weight. Seek urgent help for severe escalating pain, a deformed knee, numbness, unusual weakness, or a foot that looks pale or feels cold. Also seek review when bruising develops without a clear injury or occurs alongside unusual bleeding elsewhere.

Does the bruise fit an MCL injury, or could another structure be involved? How stable is my knee? Should I use a brace, and what activity is safe while the colour changes? Which strength and balance checks should come before football?