Yes a calcaneal spur could have formed at that location. There are a few things you need to observe.....
Are your arches flat on that side when you walk...
Is your pain worse in the mornings and slightly better through the day but then hurts again when you begin to walk after rest, this could be a pantar fasciitis. However classically the pain in that case is at the middle of the heel....
Next Steps
we need to get better heel mobility, better strength is your hip muscles, try to use orthotics (footwear inserts) or a heel cup.
**Meanwhile use ice at it helps any ongoing inflammation....
Health Tips
An online consultation could help us to start you on a group of exercises and provide you with proper advice after diagnosing your problem.