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.
Those organic acids cause the foul odor. Yup, sweat itself is odorless, but bacteria thrive because of it. Which explains the link between sweating and foot odor. The sweatier your feet, the more bacterial growth, the more chance on developing nasty foot odor. There are different types of bacteria causing the unpleasant scent: Brevibacteria. They feed on your feetâs dead skin.