I have got a small red color patch above my upper left lip and below my left nostril. it looks like a rash but it comes and goes for past 4 months.

Need to examine: It is not feasible to be sure without examining you, however, what you described suggest a cold sore, i.e., recurrent activation of herpes simplex 1 infection. 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 you have sex.