cocido
/koˈθido/ · B2 · adj
cooked, boiled
🍲 cocido = from cocer (to cook) + -ido, the 'already done' ending
Cocido is the past participle of cocer, to cook, so it means cooked or boiled. The same dish name, a slow-boiled Spanish stew, comes from this. Sore skin fits the sense of skin feeling scalded, as if it had been cooked.