To avoid developing fissures on your feet, you’re going to want to prevent infections and dry skin.
The best solution to your fissures is going to depend on the severity of the openings and the root cause. In most cases, treating the base cause of the fissure will be enough, with no need to focus on treating your fissures in particular. That means moisturizing your feet, using anti-fungals or antibiotic ointments, or shoes that fit to prevent calluses. lf your fissures are showing raw skin or bleeding, however, you may be at risk for more serious infections, and should see a doctor immediately to be safe.
Custom corrective orthotics are another treatment option that may help prevent friction and callus formation.