“…[71][72][73][74] PDLs are generally well tolerated-side effects of their use for treatment of IHs include temporary local swelling, hyper-or hypopigmentation, and rarely pain, scarring, ulceration, or hemorrhage. 75 The PDL has been used and studied for more than 30 years as an option for treatment of IHs, and, as a result, there is substantial level III-V evidence in the form of various case reports, retrospective reviews, and small, nonrandomized prospective studies supporting its efficacy in the literature. [76][77][78][79][80][81][82][83] In 2002, the first level III evidence comparing PDL therapy to observation in the treatment of IHs was performed by Batta and colleagues 84 and raised significant doubt surrounding its efficacy.…”