I have light patches on my face as well as dry patches on my face; how do I correct the discoloration? (Photos)

I have recently had steroid injections in both my knees and my back due to pain. My daily moisturizer and even toner no longer works. Although I am pain free, my clear skin is gone. I received total of 6 steroids injections in the last 8 months. How do I correct the discoloration?

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