Look into hypoidrosis and anhidrosis.
It may affect only certain parts of the body.
Pay attention to all details in what you are doing,
eating, drinking, etc. at all times, in order to identify any
possible triggers.
Always stay well hydrated, avoid steroids, stress,
excessive carbs/sugars, overtraining.
You should consider to see your doctor and to get tested for
any deficiencies.
Are you perhaps vegetarian or vegan?
Best wishes,
Niko