Why does a bruise change color?

Short answer

The visible color changes as blood under the skin is broken down and absorbed by the body.

How it works

Color alone does not show severity. Unexplained or increasing bruises and strong pain should be discussed with a professional.

Key point

The practical point is this: Unexplained or increasing bruises and strong pain should be discussed with a professional.

References

• National Institute of Arthritis and Musculoskeletal and Skin Diseases: Learning about skin
• National Institute of Dental and Craniofacial Research: Oral health