While it strictly depends, while when using my slaves for flogging, paddling, spanking my slaves, (I have caned subs or slaves when training, but haven’t really caned my collared slaves) we have a understanding that bruises are okay any where on the body and leg area, wile my slaves have no limits other then scat and things like that.
To address your first question, I have left bruises when spanking my slaves, and it was more then alright, I am only assuming when you say how did you feel meaning was I sad or angry, but no I was not, it was a mutual disciplinary action taken so both sides understood it needed to be done.
To address the second part do I enjoy it and look forward to it, I must say I do, while I understand every one is not like I, yet I am a very dominating Sadist, so during sessions the slaves often incur bruises that can sometimes take a week or so to go away.
Though I do not belong to local groups for several reasons, a few of my Master and Mistress friends do get together every few weeks, to enjoy ourselves, discuss subjects, both bdsm related and life related topics, yet at these events the slaves have on little clothing as they serve those at the parties, well the bruises can be seen by those who attend parties, and both of my slaves are open about their lifestyles to friends and those in which they come into contact with daily, so they have no problems showing their bruises, they as far as I know do not flaunt them, but do not go out of the way to cover them up either