If you have a scab, it's considered normal to see it change into a yellowish color over time. This is completely normal and is the result of the hemoglobin from red blood cells in the scab being broken down and washed away.

What does it mean if a cut looks yellow?

Signs of Infection

A skin infection happens when there are too many germs for your body's white blood cells to handle. If you notice any of these signs of infection, call your doctor right away: expanding redness around the wound. yellow or greenish-colored pus or cloudy wound drainage.

Does yellow on a cut mean infection?

Purulent Wound Drainage

Purulent drainage is a sign of infection. It's a white, yellow, or brown fluid and might be slightly thick in texture. It's made up of white blood cells trying to fight the infection, plus the residue from any bacteria pushed out of the wound.