I have had a small lump on the back of my heel, level with the top of my shoe, for around 4 years. It is circular, domed, around 6/7mm in diameter and is mobile(not attached to the bone.) It is hard but not bone and not fluid filled either. It doesn't hurt unless rubbed by certain shoes when walking. It is more irritating than anything but just hasn't gone away of it's own accord. Just wondered if anyone had any idea of what it could be.
It is difficult to comment about the cause of heel lump without a careful evaluation. It can be due to any injury,inflammation,trauma,tumour etc.There is one condition called haglund's deformity which causes enlargement on the back of heel.It can occur due to tendency to walk on outside of heel or even can be a hereditary condition.
You can consider using heel pads which help to avoid irritation.But it is better to get it physically examined once so that the exact cause can be ruled out after clinical assessment.
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