A condition causing abnormally heavy sweating beyond what is needed to regulate body temperature.
To support a 30% rating, evidence would need to show both that moisture prevents you from handling paper or tools and that treatment has not brought the condition under control. Medical records documenting failed treatment attempts are central here. Notes from a dermatologist or primary care provider recording the specific therapies tried, the doses or methods used, how long treatment was attempted, and the provider's conclusion that the condition is unresponsive would all be relevant. An examination finding that your hands remain too wet to grip paper or tools despite ongoing therapy directly addresses the criteria.
To show the 0% level, records would reflect that therapy, whether topical or systemic, has allowed you to handle paper or tools, even if sweating continues.
Your own statements, or statements from people who work or live with you, describing how moisture affects your ability to hold objects, use tools, or manage everyday tasks can help fill in the picture that clinical notes may not fully capture. Treatment records showing what was prescribed and when are key at both levels.
Conditions that are often caused or made worse by this one. If you have any of these, they may be claimable as secondary service connection.