Hyperpigmentation
Use of concomitant bleaching cream can also help as a preventive strategy for hyperpigmentation. But one study of 100 patients found that pretreatment with a bleaching regimen prior to undergoing CO2 laser resurfacing made no significant difference in hyperpigmentation compared with those who received no pretreatment regimen.
When Dr. Ortiz is concerned about hyperpigmentation after laser treatment, she prescribes post-treatment tranexamic acid 325 mg twice daily for 6 months or longer. “I don’t do any kind of workup or labs, but I do not prescribe it if a patient has increased risk of clotting,” she said. Those at increased risk include smokers, those on birth control pills, those on hormonal supplementation, those with a current malignancy, and those with a history of a cerebrovascular accident or deep vein thrombosis.
Hypopigmented, atrophic scars
In Dr. Ortiz’s clinical experience, hypopigmented scars respond well to treatment with the 1550 nonablative laser. “The idea is that you’re removing some of the scarred collagen and it allows the melanocytes to migrate in and repigment,” she said. Following laser treatment, consider applying topical bimatoprost 0.03% twice daily for at least 3 months to optimize results, she added.
For atrophic scars, options include subcision, laser treatment, radiofrequency microneedling, fillers, or biostimulators. “I caution against using permanent fillers because there is a higher risk of granuloma formation,” Dr. Ortiz said. “I tend to use hyaluronic acid fillers, which have a low G prime. I inject superficially.”
She shared a technique she learned from Mathew Avram, MD, JD, director of laser, cosmetics, and dermatologic surgery at Massachusetts General Hospital, Boston. It entails spreading the skin with one’s fingers for a scar, especially an acne scar. “If it improves when you spread the skin, then you know it’s amenable to laser treatment,” Dr. Ortiz said. “But if it doesn’t improve when you spread the skin, it probably needs a little subcision. Insert an 18- or 20-gauge tribeveled hypodermic needle or an 18-gauge Nokor under the scar to sever the fibrous components that anchor the scar. This can take more than one treatment. I’ll often do this immediately before resurfacing.”
For hypertrophic scars, consider laser-assisted drug delivery, which creates vertical channels that assist the delivery of topically applied drugs into the skin. “You never want to use something that isn’t meant to be injected into the skin because you can get a granulomatous reaction,” she warned. “I often use topical triamcinolone acetonide, 5-FU, or poly-l-lactic acid.”
Dr. Ortiz noted that botulinum toxin type A may be helpful for scars, despite the paucity of evidence regarding specific mechanisms of action. “There is some thought that it can modulate TGF-beta,” she said. “It also may modulate collagen deposition. Currently we’re looking into Botox alone for keloid scars. The initial results look just okay.”
Dr. Ortiz disclosed that she has received consulting fees from Alastin, Cutera, and Sciton, and honoraria from BTL and Procter & Gamble. She is also a member of the advisory board for Aerolase, Allergan, Bausch Health, Endo, Galderma, Rodan + Fields, and Sciton, and has received equipment from BTL, Sciton, and SmartGraft.