How do I get rid of the severe discoloration around my mouth I've had since the age of 4 ? (Photo)

I have had eczema for almost all my life. I have cracks on the corner of my mouth. The eczema makes me itch around my mouth every day. As a child I constantly would lick my whole mouth to temporarily relieve the dryness, may be a reason why my mouth is dark. Prescribed topical steroids that i've used for YEARS that are small fixes with the itching. The steroids may be thinning and darkening my skin as well, but i may be wrong. Any suggestion / treatments / tips would be greatly appreciated.

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