Nothing, it's just that the blood flow increases and the body temperature rises after fitness, which may lead to a slight protrusion of blood vessels. Observe for a few more days, and go to the hospital if it continues to swell. With my medical experience, there should be no problem. You'll be fine when you're all calm. If it doesn't decrease in a few days. Or more and more drums, then go to the hospital, go to public hospitals, private ones are too expensive.