An autoimmune condition causing sudden hair loss in round patches on the scalp or body.
To support a 10% rating, your records would need to show total loss of body hair, not just on the scalp and face. Dermatology notes or a VA examination documenting the extent of hair loss across your body are the most direct way to establish this. Photographs taken during medical visits that show affected areas beyond the scalp and face can also help. To support a 0% rating, records showing that hair loss is confined to the scalp and face would reflect that level. A statement from you describing which parts of your body are affected, and how the condition has changed over time, can help the examiner understand the full picture. Any treatment records, whether topical or systemic, that describe the areas being treated may also help show the scope of the condition.
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.