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I get what you mean
but even releasing from the hand and feat putting it into a person's system (like you stated) is a Hyuga feat
by not doing so then you just have CES like Tsunade
Or chakra scalpel to be more precise hitting inside and causing internal damage while avoiding damage to the skin.
This is different from attacking the points and injecting them that's definitely a Hyuga feat and kekkei Genkai dependant.