An action done on mosquito bites. What am I ?

Question

I am an action that speaks loud and clear,
But often goes unsaid, though it's always near.

It's something we do without a sound,
And yet it fills the air all around.

It's a feeling that's true, both deep and pure,
A declaration of love that will always endure.

What am I?

Answer 1

we scratch on the mosquito bite.
So the answer may be Scratch