Just below my ankle there is small red patch. it brownish/pinkish/redish. it hasn't grown. thankfully there aren't any other on rest of my body. it doesn't hurt or itch?

You may watch and wait. If the patch more than doubles in size, bleeds, ulerates, other patches develop, you get fever or lose weight, 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 vaccine. Wish you good health!

This could be a psoriatic patch developing. Check your scalp to see if there is any signs of psoriasis present. Does it itch? Other possibility might be lichen plannus. You may want to have a dermatologist or podiatrist check to see .