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Hi. Welcome to Just Answer. My name is***** I'm sorry to hear about Luna's situation. A bump below an eye in a dog has me pretty darn suspicious for a situation called a tooth root abscess with the upper 4th premolar (carnassial tooth). Basically the root can get an infection with it and then this causes a swelling below the eye that forms an abscess. It a lot of times will open / drain and have some not so pleasant drainage. Could the bump be from a bite of an insect? Some trauma? Some other growth? These are also possible, but at my ER, pretty much these cases typically are tooth root abscesses. The best thing I can recommend is to get into your vet so they can check her over. If it is the tooth root abscess, they will recommend a dental and tooth extraction to correct the situation.
The initial visit to your vet shouldn't be pricey. They can check her over and give you their feelings on the situation. They can then start her up on antibiotics if it is the tooth root abscess and then give you estimates for fixing it surgically. Honestly, cost varies so much by location and clinic that I can't know what it would be specifically. Here is just one link on the tooth root abscess. If you google it, you can find numerous pictures of dogs with them.
I'm glad to hear that Luna has her dental scheduled. I hope all goes well with it. Sometimes these can go down as they have some drainage of the pocket into the oral cavity or to the outside. Giver her a good ear scratching for me!