I burned my fingertip three weeks ago?!

And there was a bubble the next morning when I woke up!. I didn't pop it because I heard that you should leave it alone!. Now the bubble is gone but left a hard shell where the bubble used to be, it doesn't look like a scrab because I can't pick at it or peel it off, its stuck on my skin and the color is purple!.!.!.what does that mean!?Www@Answer-Health@Com

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