Hello. Thank you for writing to us at healthcaremagic After going through your query I suggest a possibility of pityriasis versicolor, which is a superficial fungal/ yeast infection of the sebum rich areas like back, shoulders and chest. The infection is common in hot and humid weather conditions. Clinically it presents as light brown scaly patches on torso. The scaling is fine Or brawny. The patches are usually asymptomatic. Diagnosis is obvious clinically. However, a KOH wet preparation made by scraping a small amount of scale from one of the lesions and visualized under the microscope for fungal elements is confirmatory. Treatment is with single dose of an Oral antifungal e.g either fluconazole Or Itraconzole. Alternatively, daily antifungal body wash with a ketoconazole based shampoo is also an option. The lotion should be lathered in well and left for 5 minutes to act and then rinsed off. This should be continued for 5 days. I suggest you to visit a dermatologist in your vicinity for a confirmatory diagnosis as well as appropriate treatment. Regards