A Dermatologist Froze an Age Spot Yesterday. Is This Normal? (photo)

Freezing skin lesion results in an injury to the tissues and the healing process will take 4 - 6 weeks. Large lesions like this on the face may also be a lentigo maligna, which may be a precursor of melanoma. A biopsy is always a good idea for these type of lesions.

This is not at all unusual. I prefer lightening creams or laser treatments but liquid nitrogen can be highly effective. The darkening that you've seen overnight should improve with time and the pigment that was treated should also lighten with time. I hope this information is helpful.Stephen Weber MD, FACS

This question is a few years old now but it remains relevant as these types of lesions much be checked by a dermatologist before they are treated. Spreading lesions with darker areas can be suggestive of sun spots or more sinister things that must be excluded first.
That said, cryotherapy is a reasonable treatment and this is what it looks like the next day. However eight years on we are using more sophisticated techniques such as the hyfrecator device which offers quicker results, more controlled destruction of the lesion and faster healing.