I got a splinter in my heel, I grabbed some tweezers and a needle, sterilize the needle by holding it over a flame for awhile and soaping it too, then pick away until you find it. if it gets red and crusty it's infected and you should probably go to a doctor. just poke and prod for a bit, it's weird at first but then it's no big deal. clean it afterwards and maybe put a band aid on it for awhile to make sure it stays clean if it's deep.
"I could ski every day for the rest of my life and never get bored." -Ligety