Can Having a Partial Hysterectomy Fix Melasma?

I have had hyperpigmentation on my face for over 4 years now, and have tried "everything" to get rid of what is already there, but also find ways to stop getting it. I am on Retin-A for the cosmetic symptoms but my question is, since from my understanding this is a hormonal problem, would getting a partial hysterectomy finally fix the reasons why I get this at all? I am extrememly sun smart (for the last 4 years anyway), I have endometriosis, I have a 3 year old child, my ethic background is Lebanese, Russian, and French, my skin colour is "white" (I would say yellow), and I have dark hair, and I now live in QLD, Australia - one of the highest UV factors in the world. Thanks in advance.