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Stoo61
It is ammonia, when your body goes into starvation/ketosis but you don't have enough fat to burn, your body starts using amino acids (either from food or your muscles) for energy which, by some chemistry, results in you producing ammonia which you should be urinating out but if you are not hydrated enough to do so, you will sweat it out.
@hippy I've also got heavier after touring, it's an excuse to eat way more than you actually need.