Severe Arm discoloration from dark to light patches, can anyone help me? (photos)

What can I do to help the dark and light patches on my arms? And also acne is also been there but I'd rather have the discoloration taken care of first. Back story to this, as I was little I had light color peaches on my face but as I got older it went away. Now I've been struggling with the color on my arms, I'm 23 and I believe the patches on my arms came out around 13/14 years old. I stay away from the sun because I feel like the parts where it's dark gets darker only...

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