Where does “mozůlek” come from?

mozůlek (Czech) comes from Czech mozol, from Old Czech [[mozol]]/[[mozel]], from Proto-Slavic *mozolъ//*mozolь.

Ancestry of “mozůlek”, step by step

StepLanguageWordMeaning
1Czechmozolcallus hardened part of the skin
2Old Czech[[mozol]]/[[mozel]]—
3Proto-Slavic*mozolъ//*mozolь—
Every word from Proto-Slavic *mozolъ//*mozolь →Every word from Old Czech [[mozol]]/[[mozel]] →Every word from Czech mozol →