Hi. Most likely you have a heel spur--a comma-like extra bone growth coming out of the calcaneus--the heel bone.
Quite often these can be present for many months before they start to cause any pain symptoms
For now you can try ibuprofen and shoe cushion inserts and staying off the foot as much as possible but if this continues for more than a few days you need to see your doctor for an x-ray and a cortisone injection
Let me know if you need more information please