Please answer! I have bruised for no reason??? Why?

I went to bed one night, and my knuckle was aching, but like inside-shooting pains. It felt like i needed to crack it but it was stuck, quite annoying but not painful. I finally managed to click into back into place and it was a relief, but i woke up and it is red and blotchy with big purple splotches on it. I... show more I went to bed one night, and my knuckle was aching, but like inside-shooting pains. It felt like i needed to crack it but it was stuck, quite annoying but not painful. I finally managed to click into back into place and it was a relief, but i woke up and it is red and blotchy with big purple splotches on it. I pressed it and it doesn't feel bruised but it looks like I've punched the wall but i haven't even knocked it! Why is this??
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