Would anyone have advice about tipping convention for electrolysis sessions?

The convention is that you don’t have to.

If you wish to, you may, but some electrologists won’t take a tip from you even if you offer. Just make sure that if you WANT to tip, that you are actually doing so because you are GREATFUL enough to want to extend a GRATUITY out of GRATITUDE and no other reason. Just say that you wish to show your pleasure at finding your expectations exceeded by the great work that you have received.

Your electrologist will not be expecting tips, nor will he or she think less of you if you don’t.

Thank you James, that’s a great help. I really appreciate your response!

You are welcome, and since this is a recurrent question, for more on this subject, see the link for a more lengthy discussion on this subject.