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If you’ve ever broken out before a big event, flushed during an awkward moment, or felt itchy when you’re anxious, you already know  the truth: skin is not just a “surface.” It’s a sensory organ wired to your nervous system, soaked in stress hormones, and in constant conversation with your immune system. Neuroscience and dermatology increasingly describe this as a bidirectional skin–brain axis : your emotions and nervous system influence the skin, and signals from the skin (i