Hello! I have the exact same problem, although I do have some crusting and itching once in a while in the same place behind my right ear. What I do is when I shower in the morning, I take a pair of rough bath gloves, soap them up, and gently scrape away the dead skin.
When they are absorbed, they can be released in sweat through skin. Foods like yogurt, onions, garlic, red meat, cabbage, spices like coriander, and asparagus may result in increased body odor when consumed in large amounts. When you have a diet rich in proteins, you may have vinegar like smell on sweat.
Quick Answer. Sweat smells sour due to bacteria that is present in the body. When a person gets hot, the sweat glands open and two substances are released, according to the Mayo Clinic. These substances mix with the bacteria naturally present on the body and may produce a sour odor. Continue Reading.