Why do ballet flats make my ankle swell & buldge over my shoe?

I'm not overweight.

I've noticed that my left ankle swells & buldges over the shoe whenever I wear ballet flats.

I work in a fancy corporate environment so sandals & sneakers aren't an option.

I don't wear heals cause I don't like them.

We are in summer at the moment & I wanted to wear a black cotton knee length dress tomorrow but have no idea what shoes to wear them with.

Any ideas?

The arrow in the photo is the part of the shoe that causes my ankle to swell. The side part.

Why do ballet flats make my ankle swell & buldge over my shoe?

Thank you

Why do ballet flats make my ankle swell & buldge over my shoe?
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