Researchers in Spain have found that at least some of the individuals claiming to see the so-called aura of people actually have the neuropsychological phenomenon known as “synesthesia” (specifically, “emotional synesthesia”). This might be a scientific explanation of their alleged ability.
Personally, i think auras are complete bulls**t. I like what the Skeptic’s dictionary has to say on auras:
In the New Age, even the lowly amoeba has an aura, as does the mosquito and every lump of goat dung.
Under ordinary circumstances, auras are only visible to certain people with special psychic power. However, with a little bit of training, or with a special set of Aura Goggles with “pinacyanole bromide” filters (available at your local New Age Head Shop), anyone can see auras.
On the other hand, you may also see auras if you have a migraine, a certain form of epilepsy, a visual system disorder or a brain disorder.