It can spread and effect the other organs in your body.
Leprosy is lethal if you can't get it treated because your body parts start to fall of and your body falls apart.Ps joshua bolton is awsome
If left untreated it can kill you.
it hurts and puss comes out
you will eventually die well....... Y.O.L.O.
you die a slow and painful death in the pits of hell
Eventully the infectiopn would take over your whole lungs and sufficate you.
prolonged papilledema can result in permanent damage to the optic nerve which could lead to blindness.
An untreated dry socket can lead to infection.
If left untreated, a more serious infection may develop within the fluid, called empyema.
Many people are very embarrassed if they have leprosy. They feel like are different and look different. Many people do not leave home as they think they will get looked on differently. this is the real answer not what that other person put : S
Cats and dogs can die it heart worm is left untreated. Call your vet.
If you do anything about it, then by definition you aren't leaving it untreated.