Is this cancerous???

👩🏻

This showed up a day or two ago on my knee. I thought it was chocolate so I rubbed and rubbed, but it was still there. This photo was taken after rubbing.

Sorry for the hair - I just gave birth to my son and I haven’t had time to shave.

It’s like there’s been a shot given, but there’s no shot that I’ve had in that area. I am kind of worried - this isn’t normal.

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