Have chronic heel pain examined by a sports physician. Know the term Seaver's syndrome. This condition is caused when two parts of the heel bone don't properly fuse in a growing, active child. It is a common problem among youth athletes. Apply supportive taping of the heel as a preventive measure.
Rest is important.
Many times, foot problems mean that a child will have to take time off of playing. It's important to enforce rest when indicated or healing may be even further delayed. Consider supportive shoes. Most soccer shoes can be made more supportive by the use of store-bought inserts. Inc. How things get done.