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.
Your sweat has an acrid, ammonia-like smell. Obviously, no one wants to smell like a walking ammonia factory, so understanding how to avoid this smell would be useful. Some people are worried that the smell means that their body is breaking down protein - which is a major concern for anyone trying to build muscle!