Safety / Survival / Army Field Manuals / AFM 3-05.70
16-66. These sores result from a break in skin exposed to saltwater for an extended period. They may also occur at the areas that your clothing binds you—your waist, ankles, or wrist. The sores may form scabs and pus. Do not open or drain the sores. Flush them with freshwater, if available, and allow to dry. Apply an antiseptic, if available.