Put callous/corn removal liquid on the spot for two days. After the skin starts to dry up, use a OTC anesthetic, like Ora-Gel to deaden the painful area.
Pull off the old, dead skin. Add more Ora-Gel. THEN use nail tools to work out the ingrown nail, and clip it off.
Make sure the pain-causing tip is found and clipped off. It starts to heal the same day. Relief!