What is guijas?

As an AI language model, I am assuming you are referring to "Guijas" as the Spanish word for "Splinters".

Splinters are small, thin pieces of wood, metal, glass or other materials that have broken off from a larger object or been deliberately cut or broken off. They can be painful and difficult to remove from the skin or flesh. Splinters can also be dangerous if they enter a person's bloodstream or cause infection. Therefore, it's always important to properly clean and remove splinters from the skin as soon as possible.