What should i do i have what i think is ring worm on my legs and arms and also a rash like allergic reaction?

Try an over the counter ringworm treatment. If that does not resolve the matter in a week or so, it would be prudent to see a doctor. For healthy diet: http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. Get HPV and Covid vaccines. Wish you good health.