I am hoping you can think with me, and perhaps help me solve the mystery of a lump I have on my heel. I have had warts and bunions and I know what they look like. That is not it. I have also had bad shoes that causes bruises and growths - that is not it either. It is a flat-ish lump, not on the skin but underneath it. What on earth could this be? Do I need to be worried?