Acne nodules are solid masses, not the pus-filled bubbles you get with surface pimples or cysts. They form when a pore wall ruptures deep in the skin and releases bacteria, dead skin cells (keratin), oil, and inflammatory substances into the surrounding tissue. Your body responds with intense inflammation, which is why nodules feel hard, painful, and often warm to the touch. Because the contents sit deep with no opening at the surface, squeezing doesn't release anything and usually makes scarring more likely. A dermatologist can assess what's happening below the skin and recommend the right approach to help the area look calmer and lower the chance of marks sticking around.
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