Hey T.: Have you considered getting him orthotics, arch supports or heel cups? Also, you've got to ice it. I know... Everyone hates to ice, but it really is the only thing that can reduce the inflammation in the tissues.
Its probably better to deal with this now instead of when it starts summertime and all the kids want to run around barefoot or in no-arch support sandals.
http://familydoctor.org/online/famdocen/home/healthy/phys...
How is Sever's disease treated?
First, your child should cut down or stop any activity that causes heel pain. Apply ice to the injured heel for 20 minutes 3 times a day. If your child has a high arch, flat feet or bowed legs, your doctor may recommend orthotics, arch supports or heel cups. Your child should never go barefoot.
If your child has severe heel pain, medicines such as acetaminophen (one brand name: Tylenol) or ibuprofen (some brand names: Advil, Motrin, Nuprin) may help.
Will stretching exercises help?
Yes, stretching exercises can help. It is important that your child performs exercises to stretch the hamstring and calf muscles, and the tendons on the back of the leg (see pictures 1, 2 and 3). The child should do these stretches 2 or 3 times a day. Each stretch should be held for about 20 seconds. Both legs should be stretched, even if the pain is only in 1 heel.
Your child also needs to do exercises to strengthen the muscles on the front of the shin (see picture 4). To do this, your child should sit on the floor, keeping his or her hurt leg straight. One end of a bungee cord or piece of rubber tubing is hooked around a table leg. The other end is hitched around the child's toes. The child then scoots back just far enough to stretch the cord. Next, the child slowly bends the foot toward his or her body. When the child cannot bend the foot any closer, he or she slowly points the foot in the opposite direction (toward the table). This exercise (15 repetitions of "foot curling") should be done about 3 times. The child should do this exercise routine a few times daily.