Darkening of a scar after sun exposure – what to do?
You’re not alone on this. A true scar is usually whiter than your baseline skin tone and will usually stay whiter. If you’re having trouble with more color after a chemical burn, it’s often more a persistent post inflammatory hyperpigmentation problem (PIH). Your dermatologist would be able to diagnose this and tell you which it is so please see her/him.
As you all know, I’m don’t advocate for using hydroquinones long term. However, in my opinion, they have a role in treating certain problems for 1-6 months using 2-4% (the currently FDA approved) concentrations. There are various versions of this and the 4% in the U.S. must be by prescription.
Remember that about 10% of people have the opposite effect (the skin darkens) and should stop it right away if that happens or the skin is irritated in any way.
Link to more on hydroquinones.
Hope this helps, Dr. I