When to Call Your Doctor

Check the cast and the skin around the edges of the cast everyday. Look for any damage to the cast, or any red or sore areas on the skin.

Call the doctor immediately if any of the following happen:

The cast gets wet, damaged, or breaks.

Skin or nails on the fingers or toes below the cast become discolored, such as blue or gray.

Skin, fingers, or toes below the cast are numb, tingling, or cold.

The swelling is more than before the cast was put on.

Bleeding, drainage, or bad smells come from the cast.

Severe or new pain occurs.

Source: http://www.emedicinehealth.com/cast_care/page8_em.htm