I got a splinter in my finger about 2 or 3 weeks ago and I can't seem to get it out. I've prodded it a few times with a sterilised needle but with no luck. It drains the pus and it bleeds a bit but then forms a lump again around where I think the splinter is. What's the best way to deal with it? Should I leave it alone and see if it works it's way out?