It is very common for women to find that their armpits turn black after giving birth to a baby. This is due to the pigmentation in the body of pregnant women during pregnancy due to the influence of hormone levels, and the pigmentation is usually concentrated in the armpits, neck, groin and other locations, and some pregnant women even have darkened skin all over the body, this situation does not require special treatment. After the delivery of the fetus, the hormone level in the body will gradually return to the pre-pregnancy state, and the melanosis will gradually improve. Within a year after delivery, the skin will gradually return to its pre-pregnancy state, so this does not need to be treated. The lymph nodes in the armpits of women during breastfeeding may also sometimes become larger and related to milk distension, so it is important to pay attention if there is discomfort in the armpit area.