When i pull bacl my foreskin, right below the pee hole (on the underside of the penis tip) there has always been a whote dot, about 1 or 2 mm. never bothered me tho. is this something important?

If it has not changed in a few years, it is likely a developmental mark and not an issue of concern. You may watch it and if it changes, 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.

No. But if concerned have your MD/ Urologist check it