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That isn't normal.
However it is known that a steroid injection can cause fat to atrophy, and that may be why the fat in the breast has "shrunk" as a result of the injection.
Ideally this will get better with time.
This is called "lipoatrophy" after steroid injection.
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Both are unusual.
Ideally temporary, as most people notice return after a few months.
No other concerns. Ideally you would see return of this area slowly over 3-6 months.
Vitamin D seems to help with psoriasis.