Why Did Laser Treatment Result in Demarcation Lines?

You are exactly right. It sounds like there was overlap of the treatment area and you may have been treated with densities and high as 30-40% in these hyperpigmented areas. We published a study about 1 year ago looking at fractional treatments in Asian skin and our conclusion was that the risk of hyperpigmentation was higher with increased density. Most likely, this will be temporary and could last a few weeks to a few months. This is why it is important to have your treatment done by a physician that is very experienced in these procedures. There are topical treatments that can help resolve this more quickly, and you should discuss these options with your doctor. Sunblock with zinc oxide and/or titanium is very important everyday to help resolve this and keep this from persisting longer. Take care, Dr. Groff

Patients of color need to be aware that they may respond with hypopigmentation or hyperpigmentation when being treated by resurfacing lasers. It is my opinion that pretreatment is necessary for darker pigmented patients using higher energy lasers.

It sounds like those three areas on your cheeks got more laser than they could handle. I would not necessarily lose hope, however, as there are many good treatments to subdue the extra pigmentation and should be started as soon as your skin has healed.

Your laser physician should be able to counsel you on your options. I would recommend a very good sunscreen and a skin lightener. I hope this resolves in your favor.

Dr. Shah

Hong,
Asians tend to develop post inflammatory hyperpigmentation (PIH) status post laser resurfacing. The Erbium laser which was used in your microlaser peel and profractional has less incidence of PIH than CO2 lasers, however PIH can be managed well with compounded creams of steroids, quinones, and tretinoin. The same procedure applied to different people can have different results so it is important for you to see someone trained in cosmetic laser resurfacing to help manage your post laser care.
Dr Diana Tamboli