Abstract
We examine the electromagnetic properties of a light ($u$ or $d$) quark propagating through a dilute gas of instantons. Instanton contributions to the quark's electromagnetic form factors are found to be small. If the light quark's mass is dynamically generated by strong interactions with the instanton field, then the electromagnetic mass difference ${m}_{u}\ensuremath{-}{m}_{d}$ is finite and calculable. The mechanism by which ultraviolet divergences are removed from ${m}_{u}\ensuremath{-}{m}_{d}$ is one which should apply to any dynamically generated mass.
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