According to Dr. Carmen Castilla, M.D., a board-certified dermatologist at New York Dermatology Group and clinical instructor at Mount Sinai Hospital, skin can become dry or thin due to a significant decrease in estrogen levels. "The hormone is a major driver of hyaluronic acid, meaning lower amounts could cause skin to become dehydrated," she says. Dr. Castilla also notes that less estrogen also slows the production of collagen and elastin which can affect skin's plump nature and resilience.
In terms of nursing, breastfeeding requires a large volume of water consumption — which means your skin is receiving less hydration than it's used to. This on top of decreased amounts of hyaluronic acid often results in skin feeling dry and lackluster. Outside of hydration, sensitivity, be it to particular ingredients or formulations, is also normal for new moms. Dr. Jessica Labadie, M.D., F.A.A.D., a board-certified cosmetic, surgical, and general dermatologist and the director of lasers and cosmetic surgery at the Department of Dermatology at Mount Sinai, tells TZR that common skin flareups such as melasma and acne can also become exacerbated due to hormonal variations.
All three dermatologists agree that products containing any active ingredients discouraged during pregnancy should continue to go unused while breastfeeding. "Vitamin A products [such as retinol] and hydroquinone that stay on the skin should be avoided during this time," states Dr. Lamb. Although these products are used topically, they can be absorbed into the bloodstream and become unsafe. According to a 2022 study, retinoid absorption during pregnancy can cause harmful alterations to the organ systems of newborns. Similarly, high levels of salicylic acid should also be used with caution. Though it is less of a concern during the postpartum period, Dr. Labadie notes that it's still a good idea to steer clear of the beta hydroxy acid (BHA) as well as other chemical exfoliants known to cause distress to the fetus during pregnancy.
However, if you were taking a break from regularly prescribed skin care medications while pregnant, it's important to check with your OBGYN, and even your new pediatrician, to determine if they can be reintroduced into your post-pregnancy routine.
