Dark purple line down bum crack, not itchy not bumpy and not painful. 25 years old and not pregnant, last blood test last week was excellent results?

Weight: The line may be from the butt cheeks rubbing against each other. If you are even slightly overweight, it would be helpful to lose weight. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, low fat milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. 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. Get HPV vaccine.