If you've been treating your pigment with a solid routine and the results aren't what you expected, the type of hyperpigmentation you have might be the reason. Not because the products are wrong. Because the two most common types respond to internal factors in fundamentally different ways, and that difference changes the strategy entirely.
Melasma vs post-inflammatory hyperpigmentation covers how to tell them apart. This is about what that distinction means for the internal side.
Melasma: the type most sensitive to internal signals
Melasma isn't a mark left behind by something that happened. It's an active signalling problem. The melanocytes in affected areas are being continuously driven by inputs that mostly come from inside the body: oestrogen, progesterone, cortisol, inflammatory mediators, and metabolic signals.
This is why melasma behaves so differently from a dark spot after a breakout. It cycles with your hormones. It worsens during stressful periods. It can flare with blood sugar instability or when you're sleeping poorly. If you've ever felt like your skin has a mind of its own, improving for a few weeks and then darkening again for no reason you can identify, this is usually why. It responds to triggers that aren't on your skin's surface and can't be addressed by anything you apply to it.
Topicals manage what those signals produce. They don't change the signals themselves.
For melasma, internal factors aren't a secondary consideration. They're often the primary driver. A woman whose melasma is being maintained by hormonal input, chronic stress, or metabolic inflammation will hit a topical ceiling no matter how good the routine is, because the signals driving production are still running underneath.
This is why addressing hormonal influences, chronic stress, blood sugar stability, and systemic inflammation can shift melasma in ways that adding another product never will. That's where the real movement comes from.
PIH: fading speed depends on what's happening inside
PIH is simpler in one respect: the trigger happened, the mark was left, and now it's fading. It's not being actively driven by ongoing signals the way melasma is. The system is already moving in the right direction. But how fast it moves depends on what's happening internally.
But the speed of that fading depends heavily on your internal environment. If you've ever watched a friend's dark mark fade in weeks while yours from a similar breakout sat there for months, this is often the explanation. Same type of mark, different internal conditions.
If your inflammatory levels are elevated (from stress, poor sleep, gut issues, or metabolic factors), the skin stays in a state where pigmented cells turn over more slowly and new inflammation can re-trigger production in the same area. A mark that should take weeks to resolve can stall for months.
If your nutrient levels are depleted (low iron, low B12, low zinc, insufficient vitamin D), the skin doesn't have the raw materials it needs to turn over efficiently and clear pigment at a normal rate. Nutrient deficiencies that slow fading covers the specific shortfalls that affect this process.
If oxidative stress is elevated (from poor sleep, environmental exposure, or depleted antioxidant reserves), the oxidative environment around your melanocytes keeps them more reactive, which means even minor triggers can leave new marks while old ones are still clearing. Why free radical damage stalls fading explains the loop.
PIH doesn't require the same level of internal intervention that melasma does. But when PIH is fading slowly despite good care, the internal environment is usually the bottleneck.
Why the distinction matters for strategy
If you have melasma, internal factors should be addressed alongside your topical routine, not as an afterthought. The topicals suppress output at the surface. The internal work reduces what's driving production from underneath. Without both, the results are either slow or temporary.
If you have PIH, the mark itself is fading rather than being actively driven. But how fast it fades depends on what's happening internally. If fading has stalled or new marks keep appearing despite a good routine, checking the internal environment (inflammation levels, nutrient levels, sleep, stress) is often what unlocks the next phase of progress. Is something internal blocking your hyperpigmentation from fading? can help you figure out which factors to look at.
Both types benefit from the same internal support. The difference is how central that support is to the outcome. For melasma, it's often the difference between managing and actually improving. For PIH, it's the difference between slow fading and fading at the pace your routine should be delivering. Either way, the results you expected aren't out of reach. They may just need a layer your routine wasn't designed to address. How to treat melasma and how to treat PIH cover the full treatment approach for each type.
