Steroids whether injected, taken orally, or used topically on the skin can cause easy bruising. I would think that the bruising near the injection site is most likely due to it being the area of most concentration.
The other thing about
having repeated injections in the same area is that the skin in the area can get very thin. That is why steroid injection frequency is monitored and limited. I had a Morton's neuroma in my left foot and had three injections over 8 weeks into it. After the third, my skin was very thin and fragile over the area that was injected.
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