the lump on the lip of my rat

Question

the rat with a lump on   QUESTION: Hi, my rat is about two years old. I recently notice a big lump is growing in her mouth on the lower lip posterior to her tooth, also one of her two lower front tooth is lose. She can eat only soft food even though she has good appetite. In addition I just realize that she has little red on her nouse. What I can do to help her with that lump on her lower lip and her respiratory infection? does have a cure or I have to put her to sleep?
I attached a pic for more acure help. Thanks for take your time and help me and my rat.

ANSWER: Have you seen a vet for this?

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QUESTION: I did not seen a vet for this, but i read most of your website and yes I did found the answer for the respiratory infection, I am helping her with doxyciclin and 2.5mg two times a day. but my consern is about the lump on her mouth what I can do for help her? do you think is it curable or is it better put her to sleep? if it is the best to put her to sleep, how I can do it? Thnks Sandra for take the time to read my words. Thanks for help me.

Answer
No I would not suggest having the vet put her to sleep since she has not even been given the chance to get better from this.  It may be able to be treated by the vet. No reason to end her life for something like this unless she is suffering and it seems to me that this may be able to be removed by the vet. As for putting her to sleep, the vet would do this also ONLY if your rat has no quality of life.  At this time I suggest having the vet see her.