And what about a massage therapist? Some of them fall into the medical category and I always thought tipping wasn't appropriate. For generic, especially discount, massage, I tip, of course.
For hairdressers, the tipping guidelines have said that you don't need to tip the owner of the salon. But I always found that kind of silly. For one, you don't always know who the owner is. So I tip, period. NO ONE's ever declined my tips.