The symptoms and pictures are suggestive of pityraisis versicolor. It is a common skin
infection caused by the yeast Malassezia furfur. This skin
disease commonly affects adolescents and young adults, especially in warm and humid climates. Treatment involves topical and oral antifungal medicines.
Most cases of fungal infections respond to over-the-counter products, which contain any of several basic ingredients: miconazole, tolnaftate, terbinafine,ketaconazole and clotrimazole.