Slight swelling and discomfort at procerus after Botox.

It is not uncommon to be a bit tender in the procerus area post injection, that usually will subside after 2-3 days.  Because it was your first experience, that is not unexpected.

Swelling and discomfort, as well as bruising, are all possible after a Botox treatment.  Normally these effects are very short lasting and resolve completely.  If you do not feel you are improving over the next few days, you should contact the physician who treated you.