Crusty dark-brown or black raised formations that look like warts. They usually appear after the age of 30, and their number increases with age. They are benign tumours of the skin.
They are eliminated with the Alexandrite laser, the same technique used for lentigos.
The laser removes effectively the keratosis in just one session.
If there were differences in the skin colour tone when removing the blemishes, you can unify the tone with a fractional laser session.