Starting to worry about this ‘mark’ next to my nipple

[Evviee]

I have what I would describe as a pigmented mark? Next to my nipple. It’s not raised but it hasn’t always been there. It’s also getting bigger. Does anybody know what it may be or if I should be worried?

To me it just looks like pigment (similar to sunspots on the face) bu difficult to be 100% certain from picture. If in doubt, go to drs.

Its a blurry picture, but looks like a mole.

I'm guessing that you're concerned about skin cancer? Have you sunbathed topless a lot? Had sunburn there? Used a tanning bed topless?
If no to those I wouldn't personally worry about it

It all looks one colour and doesn't look like it has irregular edges (blurry picture notwithstanding)
Is it bigger than the top of a pencil? Does it itch? Does it bleed?

If no to those I wouldn't worry personally

But if you are concerned, see the GP. They'll be able to put your mind at rest in 5 minutes

Possibly seborrheic keratosis, bit hard to tell though. I'd wave it at a doctor if you're concerned.