When I was on a water slide I came across with a friction burn on my buttocks in between the two curves. What should I do now?

Clean and dry. Keep it clean and dry. You may put an antibiotic ointment, like a neosporin ointment, available over the counter. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex, if have sex.