Brown ring around my recently removed mole. (photo)

Hello, about a month ago i had nine moles removed by a plastic surgeon. The process was called sublimation, or something like that. Although most of the scars have dissapeared, one of the moles has developed a brown ring just on the outer corners of where the mole used to be. The color reminds me of a mole but i am concerned this might not be so innocent. What do you think?