Have hard scab on check been there over year. raised but when pull the dry hard skin off it flattens completely but like deep hole in center and bleed?

Need diagnosis: You need to consult with a dermatologist and be tested for skin cancer or to find out exactly what the diagnosis is so that you can get effective treatment

Medical check up rec: If this is recurring repeatedly, then it may need to be biopsied next time and examined by a pathologist. Show it to your doctor while this lesion has the scab on it, so that it can be verified and biopsied if needed.