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Why does my guppy have a red bump on her body?

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My guppy has a red bump on her left side right below her back. i had her in a nursery for too long and put her back in the guppy tank and she was doing fine. It came suddenly (I'm thinking overnight) and she is having trouble swimming. I know she will die soon but I want to know what is really wrong with her. I separated her from the rest of the tank just in case this is contagious. I'm really upset so if you guys can give me a serious answer, It would help me extremely! Even a guess would help me a lot so that I can research what you guys say and maybe find out what is wrong. Right now, she is at the bottom of the tank I put her in. I added aquarium salt. I NEED somebody to answer so please help me!