Does this sudden skin abnormality appear benign or malignant? (photo)

I recently started tanning outdoors for the first time in years this summer and this appeared, I don't know when exactly as I just noticed it today but the shape of it has me concerned. It isn't nearly as dark as other malignant melanomas I've seen using google but troublesome none the less. I do have a paternal family history of skin cancer and plan to get this checked out, I'd just like some kind of answer, even one that isn't toally solid, until I can make it to a dermatologist.

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