Seeing a dark, painful spot suddenly appear on your child’s foot can be alarming. Although it may look serious, it is often a blood blister caused by minor trauma. Blood blisters develop when tiny blood vessels beneath the skin break because of pressure or friction, while the skin remains intact, trapping blood underneath and creating a dark red or purple bump.

This can happen after wearing tight shoes, running for long periods, or accidentally bumping the foot. While the blister may look concerning, it usually heals on its own within one to two weeks. During that time, the area may be tender, and your child may avoid putting weight on the affected foot because of the discomfort.

The best approach is to protect the blister and let it heal naturally. Avoid popping it, as the skin covering the blister acts as a barrier against infection. Applying a cold compress can help reduce pain and swelling, and keeping the area clean, dry, and protected from rubbing can make the healing process more comfortable.

Keep an eye out for signs of infection, such as increasing redness, swelling, warmth, pus, or fever, as these require medical attention. You should also consult a healthcare professional if the blister appears without an obvious cause, becomes extremely painful, or keeps coming back. In most cases, however, gentle care and patience are all that’s needed for a full recovery.