I have crackle sound/feeling in skin after Botox. Is this normal?

That sound is commonly felt/heard during injections of botox, and can be somewhat alarming to first time patients, especially.  Some say it is the sound of the needle penetrating the muscle, others say it is microscopic air bubbles.  No need to be concerned, it doesn't cause any damage or affect the end result.

This is a normal sound. It has to do with the nerve receptors picking up the neuromodulator. Some people will hear it during injection or soon after injection if they move the affected muscles. It goes away quickly but has to do with the nerves themselves. "This answer has been solicited without seeing this patient and
cannot be held as true medical advice, but only opinion. Seek in-person
treatment with a trained medical professional for appropriate care."