Along a kitty's belly there are two lines along which their teeny nipples lie, then in the middle of the belly is a smooth bare spot where their belly button is. I think kitties have 6-8 nipples.
Do you think this pimple might be a nipple?
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See the colon marks above? If you laid your kitty out, belly up, with her head to the left and tail to the right you'd see a line of nipples like the colon marks. The first pair begins somewhere below the armpits I think and the last pair lay inside the fold of the hip, where the leg attaches to her body.
Let us know what you see. The nipple kinda looks like a little pimple but it is not red or swollen unless the cat is pregnant or nursing.