We took our cat to the vet a last month as we noticed she had an enlarged nipple. It's always been slightly bigger than the others ever since she was a kitten, but it's recently gotten huge! The vet said it was just full of fluid and gave her a shot of antibiotics, but it's now bigger and redder than before!

Should I be worried and take her back? What else could it be?

I certainly would take her back

does she seem like it is hurting her? like if you touch it does she react?

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i would take her back - it could be another infection or a possible mamory tumour

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No it doesn't seem to hurt her. The fur around it became really matted too so I'm not sure if it was weeping...

She's eating fine but in the past couple of days has started to loose control of when she goes to the toilet. I don't think this has anything to do with the nipple, but I think old age is catching up with her

She needs to go back to the vets to have this checked,and also to see why she is incontinent,14 years old is not to my mind "old"so shouldnt be dismissed as an age thing.Hope she is okay,please keep us updated.

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I would still take her to the vet. . .things that seem like they could be age usually aren't. . .

incontinence can be a sign of other problems. . .baring in mind 14 is sort of into their later years but my cat is 17 and *touches wood* is very healthy and doesn't have incontinence issues. ..so please don't just think "she's old" if your vet says it's age catching up with her you can always get a second opinion without telling the other vet that's what one vet said. . .

keep us updated
oh and cats really do like to keep their dignity and are so clean so incontinence is awful for a cat

if the vet tries to pass you off rubbish just insist they look into it for her sake

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It sounds like mammary cancer to me, especially considering her age.
Vets asap on this one. Sorry
What age was she when she was spayed? Or is she?

As others have said I would definitely get this checked again. If it's urinary incontinence then it can point to a an infection.

Just to let you all know, Amber is booked in for the vets tomorrow at 3pm. She seemed OK yesterday morning then got worse last night. When she leaned back to clean herself "down there", she started weeing It's like there was something pushing her bladder and she had no control...
She's eating and drinking fine but I will just see what the vet says. I'm worried they'll just look at her, just inject her with antibiotics again and send me away with a big bill and no proper answer

Good luck with the vet visit! You can always get a second opinion ( or see a different vet at the practice ) I did this once for years! I actively avoided one vet in particular, who despite being the owner was actually the least competent!

If it helps one of mine had a benign mammary tumour which was successfully removed. Your cat may well have an infection though.