Bruise From Clamping Normal?

So i recently started clamping maybe a month ago and so far has been excellent however I clamped two days ago did two sets of 10 mins which is about what I’d been doing recently although i did go one click further then I had before and I noticed yesterday that i had a slight bruising on one side where the clamp was. Good EQ no pain nothing out of the ordinary and Im thinking maybe this just happens sometimes after all i am squeezing the hell out of it where the clamp is.

However i am fairly careful and I dont want any injury specially now that clamping is giving me progress so out of an abundance of caution i am taking two days off. Figured I’d ask here if its normal to see slight bruising. And again its very slight i have to look carefully to see it.