In Final Fantasy 16 (FFXVI), which has a medieval-ish setting, C says that "The boil must be lanced if it is to heal". I'm...not sure I understand the phrase.
For context, C is in a conversation about causing much temporary misery for people in the act of doing them an important service (think about how destroying oil rigs would hurt people's lives, but ultimately save the planet). I'm sure the phrase he used can be likened to "can't cook an omlette without breaking some eggs", or "the pain of childbirth is forgotten when one sees the face of their child".
That being said...I'm unsure of the literal meaning of the phrase. Is it talking about poking a pimple? Aren't you not supposed to do that? Also, does this expression have any precedence (e.g. it's a common phrase that's used), or is it something that the writers just made up?