Some are able to see auras [like in Kirlean photography] and it's purely a gift - like clairvoyance. However, as one respondent has posted already, it can also be a medical symptom and while the other has suggested an optometrist, an opthomologist might be wiser. The first is trained mostly in visual issues pertaining to the eye itself. The opthomologist's a physician - can detect other things which might be going on that are revealed by checking the eyes. If there's no medical problem involved, assume it's a gift.
Such gifts tend to gain strength [like most things] with practice. It can be a sign of healing capabilities to see auras since illnesses manifest in the etheric body before they show up in the physical body. The aura is the closest etheric layer to the physical body. If you've seen the movie Patch Adams, he learns to look between what might be considered real... to see the possibilities most will not see. Reading the aura can be like that, too, in that you see in ways others usually don't. Focusing a bit off-center of the person can help clarify and intensify the colors within their unique aura. Again, practice is essential, partly to prove to yourself that's what you're seeing, and partly to train your brain to work with you.
If you're truly seeing auras, each person's will be different - with different colors, different qualities of radiance, different clouds or murky areas. And, if this is a gift you're blessed with to help the others around you, ask your Higher Self, your personal angels or guides to help you understand what you're seeing. Answers may come in dreams, perhaps in that drifty state between sleep and wakefulness, or simply sensing intuitively what that answer is.
A lot of people are having such gifts surface as if spontaneously, especially in the last very few years. You may be one of these. If so, it's a gift you're blessed with, perhaps preparing you to work in the healing arts, in some way. And, if so, you're being shown your true path before planning college, a career or a profession. Walking your true path will always elicit deep joy [even if it's no guarantee you'll make a lot of money]. You may be being shown where you'll be happiest, overall, to help you make wise choices.