Hyperhidrosis or excessive perspiration is a condition caused by an excessively active sympathetic nervous system. It is not a disease but an inherited condition. It is not dangerous in and of itself, but it can cause feet to be predisposed to fungal infections of the skin and nails. Control is usually as easy as daily light application of a topical antiperspirant like Arid Extra Dry Underarm Antiperspirant spray or Formadon Formaldehyde drying agent.

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