Red inch wide circular mark groin/base of penis area. not itchy or swollen or sore. red ring with skin coloured inside area.

Ringworm: What you described is consistent with ringworm infection. Try an over the counter medication for ringworm. If that does not help, it would be time to see a doctor. 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. 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.