Medical question! Need an answer ASAP

Okay, so on my elbow there is this darker spot about one inch long and 1/4 inch wide, at first glance it appears to be a burn but I know it's not. I have not injured myself on the elbow anytime recently and it's so sensitive around the funny bone you just can't hit it and keep going. I just discovered it last night and I was not born with it.
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Please and thank you :D
Medical question! Need an answer ASAP
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