Is it normal liquid nitrogen treatment caused age spots to blister?

Thanks for your question.  It depends on how aggressively your dermatologist froze the lesions.  If they were actinic keratoses, and quite thick, we usually freeze them long enough to cause a small blister or inflammatory reaction, so the body will take care of any residual pre-cancerous cells while healing the specifically performed mild skin injury.  As far as "why would someone use old technology", some patients can't afford laser treatments, and some dermatologists don't have time to pull out an expensive and time consuming laser treatment in a busy clinic day, and have the liquid nitrogen sitting right on the counter.  If the freezing is for cosmetic improvement, a good dermatologist will know how to freeze the lesions appropriately, usually not causing a blister, and the lentigines, or brown spots, will just peel off in a few days without a lot of injury to the underlying skin.  If the lesions were seborrheic keratoses, it takes a more aggressive freeze to make those go away nicely, or sometimes we use Eskata, which is a lovely new treatment for raised seborrheic keratoses.  We take each patient's financial concerns into account, and always try to do the safest and most effective treatment.  Age spots come in many varieties, so please ask your dermatologist if there are other options if you don't like the outcome from liquid nitrogen.  Best of luck!

Thanks for your question.  Liquid nitrogen burns the skin to remove whatever.  Blistering is a normal part of the healing process.  I'm not sure why doctors are still using technology from last century that doesn't yield predictable results on age spots.  We have seen many patients after nitrogen treatments with Post Inflammatory Hyperpigmentation.  Consider some IPL PhotoFacial or PicoSure FOCUS treatments next time to treat your age spots.  I hope this helps.