What should I do? Should I be worried that this pitting is on the back of my head?

I had a cyst on the back of my head and I went to the dermatologist and got injected with what the doctor said would get rid of the inflammation and cist. It did go away, but soon the skin became sunken in and pitted. It's very depressing and every time I brush my hair or shower I feel how my head is dented there. Is this normal, and should I be worried that this pitting is on the back of my head? :(

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