So, this sentence pretty much means, it's good, heal quickly. However, I don't
understand how から contributes to the sentence. Can anyone explain?
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particle-から
いいから早く治しなよ - How is から used here?
いいから means "whatever mate"

The injured person must be pushing themselves or caring about something
specific. The other person is saying " **we don't care about this** , get well
soon."

Literally you could translate いいから by "because this is ok (just focus on
healing)"
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2021-12-17T15:23:40.240
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As oldergod's answer says, いいから is an idiom and is not a combination of いい and
から. The meaning is closest to the English idiom "alright already". For
example, if someone is in the hospital but all they're worried about is all
the work they have to do and how their boss is going to yell at them when they
get back, you might say to them: "alright already, you'll deal with that
later, for now just get better".

The idiom tends to get used when the listener is overly worried with something
irrelevant or trivial, and particularly when they won't shift their focus to
what's actually important (in the opinion of the speaker).
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良い often functions like "ok" / "fine" / "alright" in English in that its base
meaning is positive but it can be used negatively, sarcastically, or to
otherwise express a lack of need, and so in some fixed expressions it is
predominantly negative.

Look at these example conversations and their very loose translations:

Ａさん：この資料、コピーしておきましょうか。 Ｂさん：それはいいよ。

(A: Shall I prep some copies of these documents? B: That's alright.)

Ａさん：この資料、コピーしていいですか。 Ｂさん：それはいいよ。

(A: Could I make some copies of these documents? B: That's alright.)

You can see that even in English intonation and context can give the exact
same reply seemingly opposite yes and no usages.

In daily life, いいです or 大丈夫です can often functionally mean 要りません in a roundabout
way , similar to how in English "okay" can mean "yes" while confusingly "I'm
okay" is a way to say "I don't need that", or "no", while "that's okay" can
mean either depending on the context and tone. I feel the 'negative' sense is
perhaps used even more commonly than in English, for example レジ袋はよろしいですか at a
store is a common expression (saying はい results in no bag!).

The other answer provides the excellent translation of "alright already" for
いいから , but there are other phrases like もういい and よくも that also carry this
nuance.
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