If you have excessive sweating and an unpleasant odor under the armpits, here are some solutions. Firstly, keep the armpits clean by washing regularly with mild soap and water. Use an antiperspirant or deodorant to control sweating and mask odors. Wear breathable clothing made of natural fabrics. Avoid spicy foods and caffeine as they can increase sweating. If the problem persists, consider seeing a doctor. There are medical treatments available such as prescription antiperspirants or even surgical options in severe cases. Also, stay hydrated and manage stress as these can affect sweating.