Bruising is a common problem when you are employing thuddier implements on the bottom, such as a heavy paddle or even a dense rattan cane like a senior dragon cane (applied with enough force can leave heavy bruises). Lexan and synthetic canes are also notorious for leaving bruises as they are thick and dense, which is one of the reasons I do not have synthetic canes and all my canes are rattan. I do have a thick and heavy tawse which is capable of leaving bruises if applied with reasonable force.
My preferred and primary instrument of correction is the rattan cane and I have quite a few of them in my cupboard in various sizes and thickness and employ them fairly frequently. I prefer using a cane which is no more than 7-8mm thick and imparts a vicious sting and leaves raised welts but does not bruise awfully. Cutting or breaking the skin has always been my problem as I'd like to cane him with thinner and whippier canes which are capable of cutting and I have cut his skin and drawn blood a few times in the past. I try and avoid that now by letting him have his boxers on if I am particularly in a mood to thrash his bottom with a thin, whippy cane. If I do give him a punishment caning, I want the raised welts to last 5-7 days and it is a wonderful sight to see his bottom glow in reddish weals and slowly subside over days, reminding him of what he got. And I also like to run my fingers and nails thru the raised welts after a few hours of me delivering the punishment and it is an incredibly erotic experience for both of us
Arnicare gel is the standard post caning treatment we use and we are well stocked on Arnicare at all times
He loves to get over my knees after the punishment while I apply Arnicare over his raised welts and he waits in agony for me to signal him to come over and lay on my knees while I apply it and caressing him while doing it and he adores that activity. I always inspect the weals on a daily basis after the day of punishment to make sure the weals last long enough to serve him as a reminder as well as a testament to my caning accuracy and prowess
And all those days the weals last, are opportunities for him to come and lay over my knees with the Arnicare and a puppyish smile as to what he wants. I maybe quite strict and severe and resolute while punishing him but I also know how to nurture and take care of him afterwards and tend to his marks I left.