In a dream, a person who uses an eraser can signify that he has forgotten something important or needed to be fixed. It also includes him as being careless about his personal affairs and lack of discipline combined with inefficiency and laziness.
Also, dreaming about an eraser represents the act of erasing any kind of bad memories and bringing back the person to good living. It is imperative to erase any kind of bad memories from the subconscious mind. Erasing these memories helps us to forget past mistakes and make us forget negative thoughts again if they were kept somewhere else in our memory bank.