Assalamualaikum... “I am from Bangladesh. I have been suffering from

Assalamualaikum...

“I am from Bangladesh. I have been suffering from this problem for a long time. At first, red, round patches appear and there is mild itching. After a few days, those turn into dark spots, which look very unpleasant. These occur on both of my hands, both legs, and around my waist. What is the solution to this?”