Defining the Absorption Spectrum of the Skin After Application of a Popular Sunless Tanner, Dihydroxyacetone, Using Re ectance Photospectrometry.

Dihydroxyacetone (DHA) is a popular ingredient in sunless tanner and lotions. We sought to measure the absorption spectrum of hu- man skin after application of DHA. A male in his 30's applied DHA to one underarm once daily for seven days. Re ectance spectropho- tometry was performed on the treated and untreated side. The area treated with DHA revealed increased absorption in the 400-700 nm range. Compared to normal skin, the absorption spectrum of human skin after application of DHA is altered from 400-700 nm. Care should be taking with using lasers in these wavelengths on skin treated with DHA. J Drugs Dermatol. 2016;15(11):1459-1460..

Cutaneous siderosis secondary to intramuscular iron dextran treated with 755 nm Q-switched alexandrite laser: A case report.

BACKGROUND: Cutaneous siderosis is accumulation of iron in the dermis and the subcutaneous tissue secondary to extravasation of an intramuscular or intravascular iron injection. It presents as varying shades of brown macules with no distinct contours. The hyperpigmentation is permanent without treatment. OBJECTIVE: Q-switched lasers have been used effectively to treat lentigines and tattoos however, there is little data on the treatment of cutaneous siderosis with lasers. Our objective was to effectively treat cutaneous siderosis with a Q-switched alexandrite laser. RESULTS: A 50-year-old female had received nine injections of intramuscular iron dextran, one injection every 2 weeks alternating right buttock and left buttock over the course of 5 months. A couple of weeks after her 9th injection which was on the left, she noted brown hyperpigmentation in the injection area with the left worse than the right. She waited 3 months for the hyperpigmentation to self-resolve before presenting in our clinic. We utilized the Q-switched alexandrite laser to treat the patient with a test spot. One week later, there was nice partial clearance from the test spot so we commenced full treatment of the hyperpigmentation. There was significant improvement after the first treatment and she has been treated 4 times with continued improvement over the past 2 months. CONCLUSION: The Q-switched alexandrite laser is a useful tool in the treatment of cutaneous siderosis secondary to iron injection.

Treatment of acral persistent papular mucinosis using an Erbium-YAG laser.

BACKGROUND AND OBJECTIVES: Acral persistent papular mucinosis (APPM) is a rare condition with persistent flesh colored papules on the hands and extensor wrists. The authors aim to present a novel treatment option for this condition. PATIENTS AND METHODS: A female with APPM was treated using a 2940 nm Erbium-YAG laser with a 1 mm spotsize defocused to 2-3 mm with settings of 200-300 mJ until the lesion was flush with the surrounding skin. RESULTS: Healing of the wounds with resolution of the individually treated papules. CONCLUSIONS: Erbium-YAG lasers should be considered a treatment option for APPM.