If you’ve ever noticed tiny, rough bumps on your upper arms, thighs, or even cheeks — like permanent goosebumps that refuse to leave — congratulations, you might be part of the Keratosis Pilaris Club. Don’t worry, it’s a big club. Keratosis pilaris (or KP, to make it sound less intimidating) is a super common, harmless skin condition that happens when keratin — the protein that protects our skin — builds up and clogs hair follicles. The result? Those stubborn little bumps that feel like sandpaper and sometimes look a bit red or inflamed. Why It Happens and When It Shows…