First get examined to locate the fish bone/ scale. Endoscopy may be required. Local anesthesia makes the procedure easier. The fish bone/ scale may be felt/ palpated by the doctor. Sometimes, it is just the injury caused by this fish bone/ scale, which has passed through. Usually such fish bones/ scales get stuck in the tonsils or other lymphoid tissue of the throat. If it is embedded in the throat, only the tip may be seen. Once seen. removal is fairly easy. If not removed, they can go deeper and cause neck abscesses. It may also show up in neck x-rays. It may also get dislodged by a large bolus of food ( a common home remedy).