Why Does Your Skin Get Dark Spots? Three Different Causes, One Confusing Result

Most of my clients walk in calling every dark mark on their face "sun damage" or "dark spots," like it's one thing with one fix. I get why — from across the room, they all look kind of the same. But three of the most common causes I see here in my Palmer studio work in completely different ways under the skin. There's real overlap in how they're addressed, but understanding which one you're dealing with is what tells you the right route to take to clear it.

There are other types of pigmentation out there too — freckles, age spots that run in families, a few rarer ones. But the three I want to walk through today are the ones that come up in my treatment room the most: sun damage, post-inflammatory hyperpigmentation (PIH), and melasma.

What's actually happening under your skin

Every dark spot starts the same way: your skin's pigment-producing cells, called melanocytes, get a signal to make more melanin than usual in one specific area. What sends that signal, and how long it takes to show up, is where these three split completely.

Sun damage: the cumulative type

This is the one most of my new clients are dealing with and don't realize it, because it doesn't come from one bad sunburn. It builds up over years of everyday UV exposure — the drive to work, the walk to the mailbox, a summer weekend on the water — long before anyone thinks to call it "sun damage." Over time, that exposure shows up as sunspots, freckling, or a general unevenness in skin tone, usually on the face, chest, and hands.

Here's the misconception I hear the most, almost word for word: "why do I need sunscreen in Alaska?" I get it — we're not exactly known for our tan lines, and half the year it's fifteen degrees outside. But UV doesn't care about air temperature. Snow reflects it back up at your face, cloud cover doesn't block it the way people assume, and our long summer daylight hours add up fast. Most of the clients who tell me they've "never really worn sunscreen" are the same ones surprised at how much pigment shows up once we look at their skin under proper imaging.

Out of all three types on this list, sun damage is the easiest to prevent and the hardest to get ahead of once it's there. That combination is exactly why I'm such a stickler about sunscreen and other daily protective habits — not because I think everyone needs to be afraid of the sun, but because this is the one type of pigmentation where prevention genuinely does more work than anything you can do after the fact. Skip it now, and you're not just risking new pigment — you're making the road back that much longer.

Post-inflammatory hyperpigmentation: the trauma type

PIH shows up after your skin has been through something — a breakout, a cut, a bug bite, a burn, or an overly aggressive at-home peel or scrub. The inflammation itself triggers the extra pigment, not the original injury. Once the redness or the blemish fades, the dark mark left behind is your skin's overcorrection — melanocytes flooding the area with pigment as part of the healing response.

This is a big part of why I don't build treatment plans around aggressive exfoliation. Scrubbing, picking, or over-treating irritated skin doesn't clear pigment faster. It can create more of it, because you're adding more inflammation for melanocytes to react to. A damaged barrier makes this worse across the board — when your skin's barrier isn't intact, it's more reactive to everything, which means more low-grade inflammation, which means more opportunity for PIH to form.

Melasma: the hormonal type

Melasma looks similar to the other two — flat, brownish patches, usually on the cheeks, forehead, upper lip, or nose — but it comes from a completely different place. It's driven by hormonal shifts, most often estrogen and progesterone. Pregnancy is the most well-known trigger, which is where the old nickname "the mask of pregnancy" comes from. But it's not the only one. Birth control, hormone replacement therapy, thyroid changes, and the hormonal shifts of perimenopause and menopause can all trigger or worsen melasma too — which happens to be exactly the stage of life a lot of my Palmer and Wasilla clients are in right now.

And everything we just covered about UV applies here too, only more so. Sunlight doesn't cause melasma, but it makes it dramatically worse — UV light, and even visible light, signals those hormonally-activated melanocytes to keep producing more pigment. So the sunscreen habit that helps prevent sun damage is doing double duty for melasma, even on a cold, bright day in the Mat-Su Valley.

Why the difference matters

Sun damage, PIH, and melasma call for different approaches, even with the overlap. Sunscreen is non-negotiable for all three. But past that, treating melasma like it's PIH, or either one like it's plain sun damage, is a big reason so many people feel like they've tried everything and nothing's worked. That guess-and-check cycle is exhausting, and it's not because you did something wrong. It's because these are three different problems that can look nearly identical from across the bathroom mirror.

I'm not getting into what helps each one in this post. That's next week's topic. For now, the thing I want you to walk away with is this: if you've got dark spots and you're not sure why, the "why" changes everything about what comes next.

If you want a real answer, not a guess

If you're staring in the mirror wondering which kind of pigmentation you're dealing with, that's exactly what a New Client Facial is for. It's about two hours, and it includes OBSERV dermal imaging, so we can see what's happening beneath the surface instead of guessing from the outside, and build a plan around your skin specifically. It also includes your first treatment, so you're not just getting an answer — you're already underway. It's the same consultation every new client starts with here in Palmer.

Book one, and next time you look in the mirror, you'll know exactly what you're looking at.