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Hello,this is Dr. Jess. I am sorry to hear about Olive! It sounds like she oculd perhaps have a sebaceous cyst. These are pretty common in older dogs, and can pup up quickly in some (or may not be very obvious in a dog with a long hair coat). If your dog seems energetic and not bothered by the cyst, then waiting a week or two to see if the cyst will heal on its own is not an uncommon recommendation. Many of these cysts will close back up, but usually will remain and can reopen in the future. If this occurs, then surgical removal is usually needed to get rid of the cyst completely. Here is an article on this problem: http://www.veterinarypartner.com/Content.plx?P=A&S=0&C=0&A=2603
I would recommend keeping her from licking the area if she has been bothering by using an e-collar, and keeping the area clean with warm soapy water to clean the outside, and you can apply a warm wet washrag for 5 to 10 minutes a few times a day to encourage drainage while there is drainage inside the cyst.