I am a 19 year old female, I have noticed some discoloration in my hand finger nails the tip is red rest of the nail is white, I searched on google and it says that it might be an indication of heart Or kidney disease, in the past I have suffered from kidney infection and nothing more though I have heard from other doctors that I have less blood in my body, I feel perfectly healthy, but I'm worried about what may be going on, what should I do? What could it be?