After a bad fall, 10 yrs ago, I cut my hand and sought medical attention. But whenever I'd try to grip anything with the hand it would be really painful. Last night I noticed a little black dot where the scar tissue is and as I began to pick I realised that there's definitely something still in my hand. Could it be a splinter, glass or grit ? Should I pick it out myself or go to GP ? I have magnesium sulphate paste already as I no it's a drawing ointment for splinters but would it work on glass or something else?