PLEASE HELP?! Should I go to the doctor?

So, in November, I started taking a drug similar to Accutane. I finished it in April, and the results were great! I don't get zits or cystic pimples anymore. Yet, there are these deep purplish red marks left over. It wouldn't bother me so much, but there is one right on the tip of my nose. Its the darkest one of all, and it is sort of raised. I can't cover it up with makeup, because its just SO pigmented, and it is super dry around that area. To make it worse there is a smaller one coming in behind it where I have NEVER had a zit? I talked to my 70 year old dermatologist about it and he said it was like ashes after the fire? That they would go away in a month or two. Obviously he was wrong. So, should I go see a difference dermatologist about it?