My cat has a fluid-filled lump on her nipple. Is it serious?

Question

My nine year old spayed cat has developed one swollen fluid filled nipple. It's the size of a medium pea, and transparent. It does not seem painful and the fluid I expressed was clear at first with some pink hue as it nearly reduced. It refilled by the next day. Does it sound urgent or should I just keep monitoring it for now?

Lauren Jones VMD · Accepted Answer

Since the same lesion repeatedly fills with fluid, I would suspect a cyst of some sort. While this is not an emergent condition, your cat should be examined by a vet within the next week. Your vet will be able to draw a sample of fluid and cells from the lesion that can be evaluated microscopically, as this will help to determine the underlying cause. Until that time, do not express additional fluid because this can open the lesion up to infection.

My cat has a fluid-filled lump on her nipple. Is it serious?

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