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As you described, it appears like you have an eczematous disorder. Avoid sweat accumulation anywhere on your body. Pat dry the sweat as it appears. Change your clothes everyday. Take daily bath. Apply moisturers to the ry skin. Avoid sunlight exposure to sensitive areas. Eat plenty of green leafy vegetables. Drink 6-8 glasses of water a day. It can also result from Vitamin deficiency
for which you need proper diet. Best will be to approach a Doctor from Government Hospital who would be suitable considering your financial situation. Hopefully you must recover soon.