Should I tip for Botox treatment if doctor performs services at a Spa?

Question

I have been getting Botox injections by set appointment at a Spa for a year (a DOCTOR administers the injections). My question is if I should tip him as any other Spa service (like a massage)? Before a relocation my injections were at a Doctor's office (so no tipping)—but am confused by what is customary at a Spa. Insight or links to advice would be perfect! Thanks.

Please no responses to debate the effcts of botox, blah-blah-blah...will report.

Additional Details:
For those that have answered my previous question, thanks, but the botox is administered by a DOCTOR (otherwise it's a- illegal and b-not safe). Basically he is a plastic surgeon (reputable) who does "clinics" once a month at a Spa for an hour or so. So this isn't a normal hourly employee, or low-pay deal. The procedure takes about 3 min (time for 11 quick pin-pricks) and cost $550. So tip or no? Would tipping a doctor be in bad form? I don't think he'd outwardly take offense (he's a nice guy)—but don't want to offend.

Answer 1

if he also has an office outside the spa, then, no.
if he only works in a spa, yes. if he only works in a spa you need to ask yourself 'why?'.

Answer 2

1

Answer 3

I don't think tipping is in order.

Of course he would not be offended, but one tips service. He is not service: he is a doctor.

If you must, tip the hostess at the entrance, or give an envelope to the doctor specifying it is for the entrance/maid/secretary/nurse. Personally, I would not tip.