Background Axillary hyperpigmentation (AH) is a condition in which axillary skin is darker than the adjacent areas. To date, there is no standard treatment for AH. The Q‐switched neodymium‐doped yttrium aluminum garnet 1064‐nm(QS) laser and intense pulsed light (IPL) are two effective modalities for the treatment of pigmentary disorders; however, the efficacy and safety levels of both treatments for AH have not yet been compared in a controlled study. Aims To evaluate and compare the efficacy and safety of the QS laser and IPL in the treatment of AH. Methods A randomized, split‐side study was conducted on 22 subjects; all subjects received a total of five split‐side treatments every 2 weeks. The efficacy was determined using the melanin index (MI), color chart level using the Pantone SkinTone™ Guide, improvement grading scale (IGS), and patient satisfaction scores at weeks 2, 4, 6, 8, and 10. Results The results showed that there was no significant difference in MI, color chart level, IGS, and patient satisfaction scores between the two treatments. Both treatments significantly improved AH after three sessions. However, the pain score was lower for IPL treatment. The adverse effects were transient and were found after IPL treatment in one participant (4.45%) who developed hyperpigmentation and another participant (4.45%) who developed erythema. Conclusions Intense pulsed light therapy is safe and effective for the treatment of AH, with no significant difference in the outcome compared with QS laser treatment.

Background Hyaluronic acid (HA) filler injections have increased in popularity. They are usually performed in combination with other treatment modalities, including lasers and energy‐based devices, to enhance cosmetic results. Theoretically, HA and other filler injections should be performed after laser‐ or energy‐based device treatments. In some instances, however, practitioners are asked to administer laser‐ or energy‐based device treatment after HA dermal filler injection. There is a concerning possibility of HA filler degradation as a result of bulk heating generated by lasers or energy‐based devices, especially radiofrequency (RF). Aim To evaluate the effect of RF treatment at different time points on HA degradation in vivo, using clinicohistological analysis. Patients/methods Fourteen volunteers were recruited and received intradermal HA filler injections in four sites on the abdomen. One site served as the control, and the other three sites were treated with monopolar RF on the same day after injection, at 14 and 28 days post‐injection. Skin biopsies were performed at baseline and 56 days after HA injection. Histopathological sections were reviewed for residual filler in the tissue. Results The results showed that HA grading scores decreased in five (35.71%), one (7.14%), and one (7.14%) participants when RF was performed immediately, 14 and 28 days after injection, respectively. Conclusion In conclusion, RF treatment after HA filler injection may affect the integrity of the HA filler in the tissue, especially if RF treatment was performed on the same day after HA injection.