Weird lump of skin in the shape of a circle growing on near my leg area?

For about a year ish now there has been this lump of skin, in the shape of a circle growing near my leg area. It used to be about the size of a really tiny small stone, but now it’s about the size of about roughly an Australian 5 cent coin. It doesn’t hurt when I touch it, and there is so discolouring, it looks... show more For about a year ish now there has been this lump of skin, in the shape of a circle growing near my leg area. It used to be about the size of a really tiny small stone, but now it’s about the size of about roughly an Australian 5 cent coin.

It doesn’t hurt when I touch it, and there is so discolouring, it looks exactly like the colour of my skin, only it’s a lump that growing slowly.

Any suggestions on what it could possibly be??
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