###Human: What does the darker pigmentation at the armpits indicate? ###Assistant: Hello. I understand your concern. The pictures are a bit hazy. But from the given images, it looks like a fungal infection by the name of pityriasis versicolor. I would also need to see your chest, upper back, and shoulders to be sure. Kindly send clear photos of the same to make a conclusive diagnosis. Meanwhile, you can start using the following medicines. 1. Tab Fluconazole 400 mg start and repeat once after a week. 2. 2 % Ketoconazole lotion apply for 5-7 mins and wash off once a day.