Large bump on the back with slight itching, severe in the heat

Sep 12 20213 people replied
Description Of Condition:

I've been in the middle of the back for about half a year now, at first there were only two inconspicuous pieces in the central part of the back, then it went down, but it left pigmentation, after entering the summer began to be serious, two shoulders back a large bump, red itching, cool water rinse the surface will become white, but the bump will not go down, what is this ah?

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