Do doctors see a lot of patients with foreign body in a wound?

Yes: Any traumatic wound is at risk for foreign body (glass, sand, dirt, etc). That is why it is important to have a wound cleaned well as soon as possible after an injury. Get the the doctor asap to reduce risk of infection.

Wound foreign body: Even in a typical wound center seeing hundreds of patients each month, a wound with a foreign body is not a usual occurrence. Foreign bodies can be of three general varieties: human induced, as with stitches and staples left from surgery; accidental, as with gardening maladies; and exotic, as with cutis calcinosis, an abnormal healing process where the base of the wound calcifies.