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A groin bulge that disappears lying down — inguinal hernia; mesh repair fixes it. Inguinal hernia (protrusion — indirect: young, through deep ring, lateral to epigastrics; direct: elderly, medial — Hesselbach's): reducible bulge, cough impulse; repair — Lichtenstein mesh hernioplasty (tension-free). Femoral (below inguinal ligament — women: high strangulation risk — repair promptly). Complications — irreducible → obstructed (pain, vomiting) → strangulated (tender, discolored — emergency surgery — bowel at risk). Incisional (post-surgical — mesh repair), umbilical (children — usually closes; adults — repair). The painful irreducible bulge is strangulation — operate now.