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Tienes que revisar lo de rascarse por las pulgas.

Tienes que revisar lo de rascarse por las pulgas.
You have to check the thing about scratching because of the fleas.
From Lesson 340:Situational reference (lo de)·Spanish (Latin America)

Questions & Answers about Tienes que revisar lo de rascarse por las pulgas.

Why do we use lo de before the infinitive rascarse?
The phrase lo de loosely translates to "the thing about" or "the matter of." You can use it before a noun phrase or an infinitive to refer to a situation or topic both speakers already know about. Here, lo de rascarse perfectly captures "the thing about scratching."
The sentence starts with tienes (you have). Why does the infinitive end in -se (rascarse) instead of -te?
The pronoun -se is used because the scratching doesn't refer to the person you are talking to. It refers to a third party (like a pet) scratching itself. If you were telling your friend to get their own scratching habit checked out, you would match the pronoun to them and say lo de rascarte.
Why do we use por instead of para in por las pulgas?
We use por because it indicates the cause or reason for an action (they are scratching because of the fleas). If we used para, it would imply a purpose or goal, which wouldn't make sense here!
Does revisar translate to "check" in any situation?
Not exactly. Revisar specifically means to examine, inspect, or look into something (like a vet checking an animal, or a mechanic checking an engine). If you want to "check" a fact, you would usually use comprobar, and to "check" a box on a form is marcar.

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