I was wiping down the kitchen tops last week and my finger brushed against the bread board. Admittedly it's an old thing with very rough wood but the result was a splinter which went right under my nail. Fortunately the end protruded just enough to be pulled out by tweezers and then I measured it...13mms. That is one heck of a splinter!
There was no blood but I could clearly see the line along the inside of my nail. It is still sore and worse still the base of the nail is becoming more tender each day - I suspect an infection and just hope it goes away before it gets any worse.So, be warned and check your health insurance covers you for housework!