Linea nigra and skin pigmentation

Noticed a dark line appearing down the middle of your bump, or patches of your skin looking darker? Pregnancy commonly brings changes in skin pigmentation, and while they can be surprising, they’re almost always harmless and tend to fade after the birth. Here’s what’s going on.

The linea nigra. This is the dark vertical line that appears down the middle of your belly, running from around your belly button to your pubic area. You always had a faint line there (the linea alba), but pregnancy hormones darken it. It usually shows up in the second trimester, is completely normal, and gradually fades over the months after birth.

Why pigmentation changes. Pregnancy hormones (especially those affecting the pigment-producing cells in your skin) cause increased melanin, which is why various areas can darken. It’s more noticeable if you have naturally darker skin, but it happens across all skin tones. None of it is harmful.

Other areas that darken. You might also notice your nipples and areolas getting darker, along with existing freckles, moles and scars, and sometimes the skin around your genitals or underarms. Like the linea nigra, these changes are driven by hormones and usually settle after your baby arrives.

Melasma (“the mask of pregnancy”). Some people develop darker patches on the face — often on the cheeks, forehead, nose or upper lip — called melasma or chloasma. It’s very common and harmless, but sun exposure makes it worse, so daily sunscreen (a broad-spectrum, high-SPF, often mineral formula) and a hat genuinely help limit it. It usually fades after birth, though it can linger for some and be prone to returning with sun.

Caring for your skin. There’s no need to treat these changes, but sun protection is the one thing worth being diligent about — it reduces how dark pigmentation gets, especially on your face. Avoid strong “brightening” or bleaching treatments in pregnancy, and remember to skip retinoids (there’s a separate guide on safe skincare ingredients). Be patient: most pigmentation fades slowly after birth rather than overnight.

When to check a skin change. Pigmentation changes are normal, but see your GP or dermatologist if a mole changes in size, shape or colour, bleeds or itches, or if any skin change looks unusual or worries you — pregnancy is not a reason to ignore a mole that’s changing. Trust your instincts and get anything odd checked.

The dark line on your bump and the other pigment changes of pregnancy are a normal, harmless sign of hormones at work, and they mostly fade in the months after your baby is born. Wear sunscreen (your face especially), skip the harsh brighteners, and get any changing mole looked at — otherwise, it’s simply another of the many ways pregnancy reshapes your body for a while.