Ouch! Be sure and get it looked at if it doesn't get better soon. Some months ago I was watering the garden, in a rush, no glasses on....Well, as I thrust the hose into the shrubbery a splinter went under my right thumbnail right down to the bottom. Didn't think there was anything in there so put a bandaid on and drove to visit my Mother. Hours later I ended up in the Drs. office getting my thumbnail cut out and the splintered wood removed from the nail bed. It has taken months to heal and the nail is only just growing up.