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Dermatologist Froze Red Itchy Spot. Is It Too Late to Biopsy?

I had a red, inflammed itchy raised spot on my collarbone. It appeared all of a sudden and was there for a month. It itched so bad. My dermatologist called it a precancerous spot and froze it off. I am really scared about this because my birth mother died of melanoma. My derm has always been very good and biopsied everything Ive ever had. I am going to go back and get this spot biopsied. If it was melanoma (AM), would a biopsy show this... Or is it too late? Will a biopsy be accurate now?

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