You can even use a hair dryer on the lowest setting to dry the area thoroughly. To prevent jock itch, change your clothes as soon as you finish working out and avoid sharing towels at the gym. Jock itch is mildly contagious. Causes and Prevention By Dr. C. Everett Koop Substances that can cause hives in vulnerable people include milk, eggs, nuts, shellfish, berries, food additives and medicines such as penicillin and aspirin. Insect bites, sunlight, extreme heat or cold, pressure on the skin, and sometimes infections can also cause hives to occur.
Stress can make hives even worse.
Preventing Hives Finding the cause of your hive outbreak is the most important thing you can do. If you are reacting to a food, you will feel the onset of hives within two hours after you start eating. Gradually add other foods back into your diet, carefully watching for a reaction. In a notebook, keep a list of what you eat, as well as your activities and the products you use, to discuss with your doctor. Once you have identified the food or foods that cause you to break out in hives, just avoid eating them, even if they are your favorites.