Steroid injection: Steroids can cause a local thinning of the skin, whether they be topically in a cream or form an injection such as you had. When the skin is thinner, you can more easily see the capillary and other blood vessels in the upper layers of the skin, and thus the purplish coloring you note. As the skin re-thickens, this will gradually fade away.
Answered 1/5/2019
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