I tend to mark/bruise really easily.
I have used creams to reduce bruising. There's a good German one, called Marmoset Oil (Only a name, no cute furry animals get hurt!) and Arnica, which is more readily acvailable.
Generally, I like to leave bruising.
I love to know I'm marked. And it also reinforces the reason for the bruising, both visually and with the wonderful afterglow and soft, 'good' pain when sitting on a tender bruised backside.
Reducing the bruising would also have slightly disappointed my Top. He just loved to look at it later.....