That darker band of skin along your neck, jawline or underarms in pregnancy is usually a form of hormonal pigmentation — often described as acanthosis nigricans when it's velvety and symmetrical — driven by the same rise in melanocyte-stimulating hormone and oestrogen that causes melasma on the face. It's extremely common, it isn't a sign anything is wrong, and for most mums it starts to look lighter again in the months after birth.
General information, not medical advice — always check with your GP, midwife or pharmacist about your own skin and any product you're unsure of.
Why It Shows Up on the Neck Specifically
Your neck and jawline have thinner, more delicate skin than the rest of your face, and they sit in a spot that copes with constant friction — from jewellery, collars, and simply turning your head all day long. Hormonal pigmentation tends to settle wherever skin is thin, warm and rubbed often, which is exactly why the neck, underarms and inner thighs are such common spots alongside the classic melasma "mask" across the cheeks and upper lip.
Some mums notice it building gradually across the first and second trimester and becoming more obvious as the bump grows, simply because there's more warmth and skin contact happening around that whole area — a changing neckline, different sleep positions, a scarf you didn't used to need.
Neck Darkening vs Melasma vs Just Friction and Sweat
It's worth telling these apart, because they respond a little differently. Melasma sits higher on the face — cheeks, forehead, upper lip — and I've written about that pattern in Pregnancy Pigmentation: Why the Dark Patches Showed Up. Neck darkening is usually a more even, velvety tone shift, sometimes with a slightly textured feel. Then there's simple friction darkening, which shows up in the exact crease where your collar or a chain sits — that one is mechanical, not hormonal, and tends to fade fastest once the rubbing stops.
What Actually Helps, Gently
Sun protection is the single biggest lever here, because UV exposure feeds pigmentation regardless of where it sits on the body — yes, that includes your neck, which is easy to forget when you're carefully applying SPF to your face and stopping there. Beyond that, ingredients like niacinamide and tranexamic acid are well tolerated in pregnancy and help support the look of an even skin tone over time. I go through exactly how those two work together in Niacinamide and Tranexamic Acid Together.
A gentle, non-foaming cleanser matters more than people think here too, because anything that strips or over-scrubs the neck can trigger more pigmentation as the skin tries to protect itself. Skip retinoids or high-strength acids on this area until you've spoken with your GP, and go in expecting patience — pigmentation is slow to arrive and slow to leave.
When It's Worth Mentioning to Your GP or Midwife
Most neck and jawline darkening in pregnancy is purely hormonal and purely cosmetic. But it's worth a mention at your next appointment if the patches feel raised, itchy, or start appearing alongside other changes like unusual thirst or fatigue, since velvety neck darkening can occasionally relate to insulin sensitivity. Your midwife or GP can tell you quickly whether it's the everyday pregnancy kind or worth a closer look, and there's no harm in asking.
Questions Mums Ask
Will neck darkening in pregnancy go away on its own?
For most mums, yes — it gradually fades over the months after birth as hormone levels settle. Consistent sun protection speeds that process along; skipping it can make the fading take a lot longer than it needs to.
Is it safe to use brightening serums on my neck while pregnant?
Niacinamide and tranexamic acid are generally considered pregnancy-safe and are fine to use on the neck as well as the face, but always check any new product with your GP, midwife or pharmacist first, especially if you have sensitive skin.
Can I use SPF on my neck every day?
Yes, and it's one of the most useful habits you can build. A mineral SPF applied to the neck and jawline each morning, and reapplied if you're outside for the school run, helps protect against further hormonal pigmentation setting in.
Where to Start
If pigmentation is your main concern right now, the Dark-Spot Brightening Set ($154) is where I'd start — niacinamide and tranexamic acid, formulated gently enough for the neck and jawline as well as the face. If you'd rather cover your whole routine at once and build brightening in as you go, the Pregnancy-Safe Routine ($185) is a lovely alternative. You can browse the full range at alinabeauty.com.au.
Edwina x
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