Knee long black a little painful edge a little itchy skin

Sep 20 20213 people replied
Description Of Condition:

Almost half a year, at first did not pay attention to just wear long pants, knee sometimes pain, and then only to find what has grown, a little black skin, thick will be a little cracked hanging to the pants on pain, then I cut a layer, now seems to have become larger, the edge is black will have a slight itch, now the thick was I cut, send pictures to help doctors

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