I brushed up against a table and got a splinter. It swelled but remained hard and was not sensitive, nor did it hurt. However the very top is sensitive running a finger across it as if something is inside. It has a raised 1-2mm top level not exactly smooth but little dimpled around edges. It's been 1.5 year and it's still there. It's about ⅓ to ½ inch in circumference, it's rosy colored, and the surrounding skin about 3-5mm is also rosy. What is it, and how do I get rid of it?