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Skin tags are incredibly common, but if you’ve recently noticed a small flap of skin under your arm, on your neck, or near your groin, you may be wondering: “What causes skin tags — and should I worry?”Most skin tags are completely harmless, but they can be irritating, cosmetically bothersome, or even linked to underlying factors like friction, genetics, or metabolic conditions. Before deciding whether to remove them, it’s helpful to understand why they form, who gets them, what they look like,