Does anyone know what this is? The answer surprised me quite a bit.

It sounds like you’re referring to a skin growth—possibly a wart—and the answer did surprise you! Many people assume any bump is a mole, callus, or bug bite… only to learn it’s actually a wart caused by HPV (human papillomavirus), which is far more common—and usually harmless—than most expect.

Based on the context and your earlier interest in the 6 types of warts, here’s a quick guide to help identify what “this” might be:

 Could It Be One of These?
 If it’s on your hand or knee:
→ Likely a common wart: rough, raised, with tiny black dots.

 If it’s on the bottom of your foot and hurts when you walk:
→ Probably a plantar wart: flat, hard, and tender to side pressure (not direct press).

 If it’s small, smooth, and on your face or legs:
→ Could be a flat wart: pinhead-sized, flesh-colored, often in clusters.

 If it’s finger-like near your eye or mouth:
→ May be a filiform wart: fast-growing and flesh-toned.