Abrasions can seem harmless to an individual but if left untreated or not taken well care of at the right time they may end up scarring the skin permanently or infection. Even if someone has a case of mild abrasion then too it will take more than a week to heal completely. The abrasion can cause severe irritation and other harmful effects. Abrasion can also be seen expelling yellow, green or brown pus if not treated properly. The infection can further escalate to lumps which are quite painful to deal with.