The Knee is Fine

Okay, so my knee is doing good. Some strange named thing going on with my knee cap, or actually the back of my kneecap. Anyhow, no arthritis, no breakdown, just irritation. Exercises, walk on walking track at school instead of all over town on pavement. So we're through that part...now on to the skin cancer check. All clear no sign of mysterious looking moles, growths, or other weird goings on. I did get some "skin tags" freezer burned. Why am I the only one in the family to inherit my grams's moles and stuff?????