Learn English – Is “into the skin” in this sentence correct

Both are correct but used in different places. It depends on which you would use aside from the introduction. For example, if I said;

I'm going to learn about maps.

Then I would use introduction to.

I'm going to be introduced to maps.

explanation of introduced to

Also when you use this, it generally means you are being introduced to someone not something.

Now if I were saying;

I'm going into a seminar.

Then I would use introduction into.

I'm being introduced into a seminar.

explanation of introduced into

Part of the problem may be the difference in meaning between mainstream English and electronic/computer jargon. The word "integrated" has a special meaning when used in electronics: integrated circuits are electronic chips which combine many functions which (in the past) were discrete units.

English uses "integrated" as a way of describing many parts combined (often as an action) into a whole. Either "integrated" or "integrated into" would be normal in non-computer usage.

Electronic Jargon uses "integrated in" as a way of describing a feature of a device or chip. When addressing a technical audience, either "integrated into CMOS" or "integrated in CMOS" works, but (as Kai mentions in his comment) "into" implies an action (in this case the designing of the CMOS), while "in" is used to specify the features inside the CMOS.