Without knowing more about your symptoms, it is hard to say for sure, but you might have some inflammation caused by friction from masturbation or sex; you might also have a fungal infection. It’s best to see a doctor about any unusual penis symptoms, but you can also take steps at home to feel better and reduce the swelling. You can use an ice pack wrapped in a towel to help bring the swelling down, and if you are able to take an anti-inflammatory medication like ibuprofen, you could try that, as well. Make sure to keep the area clean, and you can treat fungal infections with over-the-counter antifungal creams. Once you are healed up, try using a penis health cream (health professionals recommend Man1 Man Oil) to keep the skin soft, smooth and supple. This will reduce the chances of future infections and help maintain your skin’s natural elasticity.
My penis has swollen up and I don't know what to do