Sims 2 has always been concerned about genetic issues. No matter what children you have or adopt, you can't change your appearance. They are all allowed to change when they grow up. Mirrors can only change makeup and eyebrows, and can't be modified like creation!
But there seems to be another way to change the patch.
It's in the professional award. If there is an information piece of university town, there will be a plastic surgery machine in a professional award, which can make plastic surgery, but it seems that it can't change the skin color ~