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How big is it? Is it painful? When you press it, do you feel pain? Any other symptoms such as fever? Any medical problems? Any surgeries? Any medications? Any family medical history? Can you attach the photos here including the indent and the lump?
It could be a fibroadenoma. One concern is that it is not moveable. Since the indent is with the cold temperature, it should be okay. But you should see your doctor to have an exam and mammogram & ultrasound if necessary for sure.