Small mass on in step of right foot

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Hello
My name is Sharon. Im new to this site.
My boyfriend was rubbing my feet and discovered a golf ball size, soft mass on the outer arch of the right side of my left foot of the arch.
it's soft to the touch and doesnt hurt.
Any thoughts of what this may be?
I have a family history of heart disease in my family.
i suffer fron chronic high blood pressure that is controled with Lisinipril and low sodium diet.
I am a kidney cancer survivor. Two years ago my left kidney was removed.
Just need to know if this mass is a warning sign of heart disease or something else.
Thank you, Sharon