Learn Italian: Nessun gonfiore si può ignorare.

When negative words like nessuno, niente, or mai are placed before the verb, the sentence doesn't take non. If you change the word order to put the subject after the verb, the double negative becomes mandatory: Non si può ignorare nessun gonfiore.

How does si può ignorare translate to "can be ignored"?

This uses the si passivante (passive si). When you pair si with a transitive verb and a subject (here, nessun gonfiore), it gives the verb a passive meaning. It literally reads as "No swelling can ignore itself," which translates naturally to "No swelling can be ignored."

If I wanted to say "These swellings cannot be ignored," would the modal verb change?

Yes! In a si passivante construction, the verb must agree with the subject. If you introduce a plural subject like questi gonfiori, the modal verb potere must become plural too: Questi gonfiori non si possono ignorare.

How could we apply this lesson's structure (andare + gerund) to say "No swelling is gradually being ignored"?