Learn Italian: Non facciamo eccezioni, tranne per le allergie. - We do not make exceptions, except for allergies.

While tranne often translates to "except for" all by itself, it usually connects directly to a noun (like tranne Marco). However, because the standard phrase here is fare un'eccezione per (to make an exception for), that specific preposition carries over. You are literally saying "We don't make exceptions, except for allergies."

Could I use eccetto in this sentence instead of tranne?

Absolutely. Tranne and eccetto mean exactly the same thing and are completely interchangeable. You could say ...eccetto per le allergie with no change in meaning.

Why is there an article (le) before allergie when we just say "allergies" in English?

In English, we leave out the "the" when talking about things in a general sense. Italian, however, requires definite articles for broad categories and general concepts, so it must be le allergie rather than just allergie.

Is fare always the verb used with eccezioni?

Yes, Italian uses fare (to do/make) for this expression, exactly matching the English phrase "to make an exception". Here, it is conjugated as facciamo eccezioni (we make exceptions).