Skin tone changed post partum

K

I used to be very fair skin. I gave birth to my second in June and since October I started noticing my skin tone changed. It is now tannish looking and even looks a bit orangey. My palms also has a yellowy-orangey colour on it. I did see my doctor and had blood test done, all my results were normal. Wondering if anyone experienced the same ? Feeling lost and worried 😔