Then, one day, you realize the dermatologist’s waiting room is looking awfully familiar these days and more than likely, you’re there because the wart is back on your kid’s finger. These fleshy little growths (the wart, not the kid) are caused by the papillomavirus, of which there are thirty different types. Interestingly, all the different warts you’ve read about (common wart, plantar wart, genital wart, and so forth) are essentially the same, but their appearance changes according to their location on the body. Because the virus invasion is confined to the topmost layer of skin, it manages to elude the radar screen of the immune system. When a wart does disappear spontaneously, it probably just got ‘noticed’ and appropriately zapped.