Lump/nodule under the skin.

My boyfriend noticed our 3 year old, Sophie, has a lump under her skin. It's somewhere around her ribcage on her side. It moves around with her skin. It doesn't cause her any pain or discomfort, because when I found it (had to really feel around for it) I rolled it around in my fingers and she didn't even blink. I doubt it's cancer, as she's had her leukemia shot. Everyone is up to date on their vaccinations from their check up last month.

So, from what I've read- The only possibility is a fatty cyst.  

My boyfriend doesn't want to put her through the stress of a vet appointment if they can't do anything and he also fears they will suggest surgery to remove it even if they don't have to.

So, my question is- Does a fatty cyst need to be removed? We intend to keep an eye on it and see if it gets bigger and if it does, we will take her to the vet. But we'd like to avoid the stress on Sophie if possible. 

It sounds like it may be whats called a Lipoma. Lipomas are soft masses or tumors that lie beneath the surface of the skin. They are usually palpable, with limited mobility under the skin. But because other cutaneous masses may appear similar to lipomas, it is recommended that each mass be checked. Diagnosis of this is essential, as other more worrisome masses can mimic a lipoma or it can be of the invasive type of Lipoma, which can invade into muscle tissue. You want to be sure to have this looked at while it is small and before it may become harder to remove.

Katluver4life said:

 
It sounds like it may be whats called a Lipoma. Lipomas are soft masses or tumors that lie beneath the surface of the skin. They are usually palpable, with limited mobility under the skin. But because other cutaneous masses may appear similar to lipomas, it is recommended that each mass be checked. Diagnosis of this is essential, as other more worrisome masses can mimic a lipoma or it can be of the invasive type of Lipoma, which can invade into muscle tissue. You want to be sure to have this looked at while it is small and before it may become harder to remove.

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thanks. you gave me more information than i could find. i researched it some more based on what you gave me. she will go to the vet then.