Why is my skin darkening on my neck and underarms postpartum?

Darkening of the skin in these areas during or after pregnancy is often related to hormonal changes or a condition called Acanthosis nigricans. While it frequently fades on its own, it can sometimes be a sign of insulin resistance. It is highly recommended to consult an endocrinologist to check your blood sugar, A1C, and insulin levels to rule out metabolic issues, as managing these through lifestyle, diet, or medication can help address the root cause.