SAN DIEGO – Do not use the fractional laser on tanned skin or skin that will be getting sun exposure soon after the treatment, Tina Alster, MD, advised as one of her cardinal rules for avoiding hyperpigmentation complications.
Melanocytes are already activated and ready to deposit pigment in such patients. Also, use strict posttreatment sun protection with a mineral sunscreen, she said.
Dr. Tina Alster
Fractional lasers – both ablative and nonablative – are remarkably safe, said Dr. Alster of Georgetown University Medical Center, Washington.
Her own 2008 study found side effects and complications in just 7.6% of 961 patients. The most frequent were acneiform eruptions (1.8%) and herpes simplex virus outbreaks (1.7%).
A more recent study comprising 730 patients treated with three different fractional lasers found an even lower complication rate of 4%. Complications included 5 herpes simplex virus breakouts, 13 acne eruptions, one abrasion, one bacterial infection, 9 cases of dermatitis, one drug eruption, 4 cases of prolonged erythema, one case of hyperpigmentation, one case of increased swelling and one of telangiectasia.
“We consistently find these very low incidences of less than 10%, and most of these I would term ‘side effects’ and not true complications,” Dr. Alster said at the annual meeting of the American Academy of Dermatology.
Still, if a clinician performs enough laser procedures, these outcomes will eventually occur. Dr. Alster gave her “top tips” for dealing with them when they do arise.
Tip #1: Adequate preoperative assessment
“You must be thorough in assessing all of these things: the type and location of the lesion, the Fitzpatrick skin phototype, any prior treatments the patient has had for the condition (and many have had them). We need to know of any pre-existing medical conditions, particularly autoimmune, and whether the patient has a history of scarring or delayed wound healing.”
Another part of this assessment is managing patient expectations upfront to avoid postprocedural dissatisfaction. “If someone comes to me and says ‘I want you to get rid of every acne scar on my face,’ I tell them right there, ‘I can’t do that,’” she said.
Tip #2: Prepare the patient for the expected – and the unexpected
“The overall risk of even the most common side effects, like prolonged erythema, is relatively small. But they can happen and patients need to be prepared for them.” The most common are prolonged erythema of more than 4 days for nonablative fractional lasers and more than a month for ablative lasers. But dermatitis may appear, as well as reactivation of acne, especially in patients who are having acne scars removed. There is also always the risk of infection and pigmentary alteration.”