Seung Seog Han

Q-Switched Nd:YAG Laser Therapy of Acquired Bilateral Nevus of Ota-like Macules

BACKGROUND Acquired bilateral nevus of Ota-like macules (ABNOM) is a dermal pigmented lesion common in individuals of Oriental origin. The Q-switched Nd:YAG laser (QSNYL) has been used successfully to treat a variety of benign, dermal, pigmented lesions, including nevus of Ota lesions. The similarity between ABNOM and nevus of Ota suggested that QSNYL may also be effective in the former. OBJECTIVE To determine the efficacy and side-effect profiles of QSNYL treatment of ABNOM in Korean patients. METHODS Of 42 Korean patients with ABNOM, 29 were treated with QSNYL (1,064 nm, 3 mm spot size, fluence 8~9.5 J/cm(2)), for up to 10 sessions each. Clinical photographs were taken before and after treatment. Lesion clearance was graded and complications such as hyperpigmentation, scarring, hypopigmentation, and erythema were assessed. RESULTS Of the 29 treated patients, 19 (66%) showed excellent or good results. Of the patients who were treated more than 3 times, 76% showed good to excellent results. Two patients experienced post-laser hyperpigmentation (PLH), which persisted for more than one month, but no patient experienced persistent erythema or hypertrophic scarring. CONCLUSION QSNYL is safe and effective in the treatment of ABNOM in Korean patients. Short-interval repetitive treatment is especially useful in improving therapeutic results and reducing PLH.

Effective treatment of congenital melanocytic nevus and nevus sebaceous using the pinhole method with the erbium-doped yttrium aluminium garnet laser.

Dear Editor: Congenital melanocytic nevus (CMN) is a melanocytic nevus that is either present at birth or appears during the latter stages of infancy1. Nevus sebaceous has been described as the hamartomatous locus of an embryologically defective pilosebaceous unit2. Here, we describe how we used the pinhole technique with an erbium-doped yttrium aluminium garnet (erbium : YAG) laser to treat nevi lesions in different patients. A 25-year-old male was diagnosed with CMN on his nose at birth (Fig. 1A). Emla cream (AstraZeneca AB, Sodertalje, Sweden) was applied to the treatment area prior to starting the procedure. The erbium : YAG laser (Action Er : YAG; Lutronic Corporation, Goyang, Korea) was used in continuous-wave mode, with 1-mm spot size and output power of 0.2 mJ/cm2. Multiple small holes measuring 1 mm in diameter were made on the periphery of the CMN lesion. A hydrocolloid dressing (DuoDERM Extra Thin CGF dressing; ConvaTec, ER Squibb & Sons, Princeton, NJ, USA) was applied to the lesions for ≥2 weeks after treatment. After performing 5 laser sessions at 4-week intervals, the cutaneous lesions resolved. There was no evidence of recurrence at the 1-year follow-up examination (Fig. 1B). Fig. 1 Congenital melanocytic nevus (CMN) in a 25-year-old man. (A) Before treatment: a solitary, 1-cm brown patch is visible on the right alar area of the nose. (B) One year after the final treatment session, the skin lesions resolved with minimal scarring. ... A 5-month-old infant was referred to our outpatient unit for CMN on the forearm (Fig. 1C). We performed the pinhole method of treatment using the erbium : YAG laser (Lutronic) in continuous-wave mode, with 1-mm spot size and output power of 0.2 mJ/cm2 (Fig. 1D). After receiving 6 treatment sessions at 2-month intervals, slight superficial pigmentation persisted (Fig. 1E). A 40-year-old woman presented with nevus sebaceous lesions on the right side of her forehead (Fig. 2A). We performed the pinhole method of treatment using the erbium : YAG laser (Lutronic) in continuous-wave mode, with 1-mm spot size and output power of 0.2 mJ/cm2. After receiving 5 treatment sessions at 4-week intervals, the patient showed marked improvement with only mild hypopigmentation (Fig. 2B). No recurrence was noted at the 6-month follow-up examination (Fig. 2C). Fig. 2 Nevus sebaceous lesions in a 40-year-old woman. (A) Before treatment, two 2.5-cm, well-demarcated, yellow, verrucous plaques were visible on the right side of the forehead. (B) Deep line- and doughnut-shaped holes were created to remove the nevus sebaceus ... Herein, we described how nevi lesions were effectively treated using the pinhole method. This simple method involves making multiple small holes at 2~5-mm intervals using a CO2 laser that penetrates the epidermis and deeper dermis3. The holes produced using the pinhole method are surrounded by untreated areas that promote rapid epidermal repair, thereby reducing the downtime and likelihood of side effects4. The other advantages of performing the pinhole method with ablative lasers are that this laser is easy to use and inexpensive, as ablative lasers are usually available in most dermatology clinics. To the best of our knowledge, this is the first report on the application of the pinhole method for the treatment of CMN and nevus sebaceous, so it is difficult to compare the advantages and disadvantages of the pinhole method with those of conventional treatment methods. Therefore, it is necessary to conduct further studies with a large sample to confirm the effectiveness and safety of the pinhole method. In conclusion, we suggest using the pinhole method with erbium : YAG laser as an alternative therapy for treating nevi lesions.

The Conical-Shaped, Staged Laser Ablation Technique in the Removal of a Medium Sized Intradermal Nevus

122 Ann Dermatol Received September 13, 2016, Revised January 20, 2017, Accepted for publication February 21, 2017 Corresponding author: Sung Eun Chang, Department of Dermatology, Asan Medical Center, University of Ulsan College of Medicine, 88 Olympic-ro 43-gil, Songpa-gu, Seoul 05505, Korea. Tel: 82-2-3010-3460, Fax: 82-2-486-7831, E-mail: changse2016@gmail.com This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/ licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. Copyright

Donut Ablation Method as an Alternative to Surgical Excision or Total Ablational Laser Treatment.

Vol. 28, No. 4, 2016 515 Received February 5, 2015, Revised July 6, 2015, Accepted for publication August 7, 2015 Corresponding author: Sung Eun Chang, Department of Dermatology, Asan Medical Center, University of Ulsan College of Medicine, 88 Olympic-ro 43-gil, Songpa-gu, Seoul 05505, Korea. Tel: 82-2-3010-3460, Fax: 82-2-486-7831, E-mail: csesnumd@gmail.com This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/ licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. Copyright