Hi,
It seems that you would be having
tinea versicolor.
It is superficial
fungal infection.
It is caused by Mellasezia furfur.
It is contagious and precipitated by perspiration, poor immunity and poor hygiene.
It may be exacerbated by use of soap, wetness due to sweat and water.
There are macules and patches of different colors brown ,black or hypoigmented. With mild superficial scaling. And there may be no other symptoms.
There is a perfect treatment.
Oral antifungal like
ketoconazole or itraconazole for 2 to 3 weeks may be taken.
Apply anti fungal cream like ketoconazole or setraconazole or luliconazole cream.
Shampoo with ketoconazole containing shampoo.
Avoid soap bath and keep the area dry.
Take healthy food to improve immunity.
Yet, you
consult dermatologist.
I hope you got my answer.
Thanks.
Dr. Ilyas Patel MD