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I read the definition of a word I'm pretty sure means crusty scab [瘡蓋]{かさぶた}:

> できもの・傷口が，治るに **したがいできる** 皮膜。

I believe this means "a film-membrane that can (?) follow up to fix a wound".
I'm not sure however what したがいできる (従い出来る？) means here.

Also, I have also seen this が and then a comma (が,) many times when reading
the definitions of words. Is this your normal subject marker が with an omitted
part after it?

> できもの・傷口 **が，** 治るにしたがいできる皮膜。
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2022-01-26T20:27:01.730
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2022-01-27T00:49:25.513
2022-01-27T00:49:25.513
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question
grammar words
できる after したがい meaning, and also what does "が," mean?
にしたがい expresses that one thing changes at the same time as another thing, with
a causal relationship. XにしたがいY = "as X happens, Y happens"

> 傷口が，治るにしたがいできる皮膜  
>  A membrane which is made **as** the wound heals.

I'm sure が is the normal subject particle but I'm afraid I have no idea what
the comma is for.
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2022-01-26T21:04:07.863
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2022-01-26T21:04:07.863
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answer
As the other answer says, に従い expresses that one thing takes place
simultaneously with something else. Here's what A Dictionary of Intermediate
Japanese Grammar has to say (page 269):

[![dictionary entry
1](https://i.stack.imgur.com/7RUWZ.png)](https://i.stack.imgur.com/7RUWZ.png)
[![formation
rules](https://i.stack.imgur.com/wiIBZ.png)](https://i.stack.imgur.com/wiIBZ.png)

So this becomes "A membrane that forms as a pimple or wound heals". Note that
できる means something more like "to be made" here.

が is definitely just the subject particle, there isn't an omission.
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2022-01-26T21:16:20.500
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answer