Mole removal: Does anyone know what this is? (photo)

I had a precancerous mole removed 24 years ago. In the last 6 years, this had popped up multiple times. I have a scar looking flat mole one day and a black, bruised painful mole the next. The change lasts about 6 months to a year and one day it disappears. It also reappears with hours for no known reason.