Yosef Karo, Translation:Shulchan Aruch — Orach Chaim 614…
“ A sick person is similar even if not in danger. The same applies to somebody who has an injured foot. סעיף גהחיה כל שלשים יום מותרת לנעול את הסנדל והחולה כיוצא בו אע"פ שאין בו סכנה וכן מי שיש לו מכה ברגליו: 614:4 Anybody is permitted to wear shoes to avoid scorpions or the like to avoid getting bitten if there are scorpions or other biting things around. Rem"a: If rain fell and somebody gots to get from their home to synagogue or vice versa and they are delicate, they are permitted to wear shoes until they arrive (Mahari"l) . ”
