I've never frozen any off but I burn them off with my laser all the time. I'm sure its basically the same thing. The spots raise and then will get darker and form a scab. The scab falls off like normal and takes the pigment with it. Make sure the spots arent getting infected. Put triple antibiotic cream on them at night and do not pick at them whatever you do. Also please wear sunscreen during the day to prevent them from getting darker.