Unusual Spot on skin

hello everyone, unsure what section to post this in, but recently I have noticed on my arm a small brown circular spot on my arm (opposite side of my elbow) but is not lumpy, imprinted like a tattoo.

And I’m unsure whether or not I should be worried about it? ^

Looks like a mole to me but if your that worried next time you see your GP then obviously show them.

How long has it been their, or is it you have only just noticed it