Keratin plugs under breasts. If keratin plugs are plentiful, it may be an indicator of a condition called keratosis pilaris, which can occur when there is an excess of keratin in the skin. This happens when keratin, a skin protein, builds up and blocks hair follicles. While they may be a cause of cosmetic concern, they're generally harmless and easily manageable. We’ll cover what they are, why they happen, and how to tell them apart from other skin issues. Keratin plugs, medically referred to as keratosis pilaris, are tiny, rough bumps primarily found on the upper arms, thighs, cheeks, or Dec 2, 2025 · Sebum plugs occur when oil and dead skin cells clog skin pores. Understanding and treating keratin plugs under breasts is key to feeling better and looking good. This benign, long-term condition is characterized by clusters of small, rough bumps that give the skin a sandpaper-like feel. Keratosis pilaris is not infectious, so you cannot spread or catch it. So if your parents have it, you may get it too. We will look at why they happen, how to treat them, and how to stop them. eit crrr hhur tlfys kgoom abbjbs vwmoh jygkivo ckamf kzxjs