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Riehl melanosis (RM) is a form of pigmented contact dermatitis that often poses a diagnostic challenge due to overlaps in its clinical, dermoscopic, and histopathological features with other pigmentary disorders. This report highlights significant findings and the proper approach for diagnosis. We present the case of a 47-year-old female with progressive facial hyperpigmentation (irregular, blotchy, grayish patches on the forehead, cheeks, and around the mouth) that acknowledged applying a lightening product before her complaint. Dermoscopy revealed brownish-gray dots and pseudonetwork pigmentation. The histopathological findings were comprised of hypergranulosis, interface dermatitis, and pigment incontinence. The patient's history and clinical, dermoscopic, and histopathological examination results showed features consistent with-but not exclusive to-RM, such that it was not possible to rule out lichen planus pigmentosus (LPP) and ashy dermatosis (AD). We finally diagnosed the patient with RM and treated her with medications consisting of alpha hydroxy acid, tretinoin, hydroquinone, and sunscreen. Patch testing might help because higher positivity rates were found in RM patients compared to LPP and AD. However, positive patch testing favors RM, and, regardless of diagnosis, provides a basis for substance avoidance in the treatment plan.

Leg ulcers are a problem often found in the adult population, with a prevalence of 1 to 2% in the population. Vascular disease is the most common cause. Venous disorders that occur in the lower limbs are the main cause of lower leg ulcers compared to other vascular disorders. Emerging wounds can cause pain, thereby interfering with quality of life. These conditions often persist for a long time, and they can be a health problem that leads to an economic burden as a result of a long period of wound care. Several therapeutic methods that can be chosen for wound healing purposes include light-emitting diodes (LED) and wound dressings. LED can have physiological effects such as anti-inflammatory resolution, neoangiogenesis, fibroblast and epithelial proliferation, and collagen synthesis and deposition. Furthermore, wound dressings provide an optimal condition for wound healing by creating a moist and clean environment for the wound. We present the case of a 47-year-old man with a venous leg ulcer that was treated with LED and wound dressings. After the patient underwent the eighteenth LED session, combined with wound dressings, the size, depth, and pain of the venous leg ulcer decreased.