Solar-Induced Postinflammatory Hyperpigmentation After Laser Hair Removal

The study reported the first known case of solar-induced postinflammatory hyperpigmentation (PIHP) following laser hair removal. A patient developed multiple hyperpigmented macules on her thighs due to sun exposure after undergoing treatment with a normal-mode ruby pulse laser. The treatment regimen included daily applications of tretinoin 0.1% cream, triamcinolone 0.1% cream, and hydroquinone 4% cream with sunscreen, along with monthly treatments of 40% trichloroacetic acid (TCA) on several sites. The results showed that while the amount of hair was reduced, the PIHP only slightly responded to the therapy. The study concluded that treating PIHP is challenging due to limited effective therapeutic options and emphasized the importance of avoiding ultraviolet light exposure before laser therapy. Serial TCA peels were found to provide additional benefits over medical treatment alone.