Pigmentation is often described as simply having “more” or “less” melanin. In reality, the biology is considerably more complex.
People across different skin tones generally have a similar number of melanocytes, which are the cells responsible for producing melanin. What differs is how active those melanocytes are, how melanin is produced and packaged, how pigment is distributed within the skin, and how the skin responds to inflammation and light exposure.
These differences help explain why redness, sun damage and post-inflammatory hyperpigmentation can look and behave very differently from one person to another.
It’s Not Simply About Having More Melanocytes
One of the biggest misconceptions about deeper skin tones is that they contain substantially more melanocytes. They generally do not.
Instead, melanocytes in different skin tones differ in the way they produce and distribute pigment. Melanin is packaged into structures called melanosomes, which are then transferred to surrounding skin cells called keratinocytes.
In lighter skin, melanosomes tend to be smaller and more clustered. In deeper skin tones, melanosomes are generally larger, more dispersed and more persistent within the epidermis. Deeper skin tones also tend to contain proportionally more eumelanin, the brown-to-black form of melanin that provides greater natural protection against ultraviolet radiation.
This means two people may have broadly similar numbers of melanocytes while having very different visible pigmentation.
Inflammation Can Look Different Across Skin Tones
Inflammation does not always present as bright redness.
In lighter skin tones, inflammatory conditions such as acne, eczema or irritation after a procedure may be relatively easy to recognise because erythema or redness is more visually apparent. In deeper skin tones, inflammation may instead appear as red-brown, purple or violaceous, grey, dusky or darker than the surrounding skin.
This matters because inflammation is one of the major triggers for pigmentation. If inflammation is underestimated simply because the skin does not appear visibly red, the risk of pigment changes may also be underestimated.
Why Post-Inflammatory Hyperpigmentation Can Last So Long
After acne, eczema, irritation, injury or an aesthetic procedure, inflammatory signals can stimulate melanocytes to increase pigment production. The inflammation itself may resolve relatively quickly, but the additional pigment can remain behind. This is known as post-inflammatory hyperpigmentation, or PIH. PIH can affect any skin tone, but it is often more noticeable and persistent in people with more pigment-rich skin.
Think of the process as a chain reaction:
Inflammation → melanocyte stimulation → increased melanin production → residual pigmentation
This is one reason why controlling inflammation is so important when treating pigmentation-prone skin. Aggressive treatment is not necessarily better treatment. Excess irritation can sometimes create another inflammatory response and potentially contribute to further pigmentation.
Light Exposure Matters Too
Ultraviolet radiation is well known for stimulating pigmentation, but UV is not the only part of the light spectrum that matters. Research increasingly recognises the role of visible light, particularly in people with darker skin phototypes and conditions such as melasma. This is why pigment management is rarely limited to correcting existing pigmentation. Preventing repeated stimulation from environmental exposure is also important.
Depending on the individual’s skin and condition, a clinician may recommend a combination of sun protection, pigment-regulating skincare and other strategies to reduce repeated melanocyte stimulation.
What About Fitzpatrick Skin Type?
The Fitzpatrick classification is frequently used in dermatology and aesthetic medicine. It categorises skin according to its typical response to ultraviolet exposure — from skin that burns very easily and rarely tans to skin that very rarely burns and is deeply pigmented. However, Fitzpatrick type should not be confused with ethnicity or used as an exact description of someone’s skin colour.
Two people who appear to have a similar complexion can respond differently to UV exposure, inflammation and aesthetic procedures. Likewise, people from the same ethnic background can have very different skin phototypes and pigmentation tendencies.
For this reason, Fitzpatrick type can be a useful clinical reference, but it should form one part of a broader skin assessment rather than being the only consideration.
Why This Matters in Aesthetic Treatments
Understanding pigment biology is particularly important when considering treatments that intentionally create heat, inflammation or controlled injury within the skin.
These may include certain:
* lasers and light-based treatments
* chemical peels
* resurfacing procedures
* microneedling treatments
* energy-based devices
Treatment parameters that are appropriate for one person’s skin may not be appropriate for another. A proper assessment should consider not only visible skin tone but also the individual’s history of pigmentation, response to previous treatments, tendency to develop PIH, recent sun exposure, current skincare and the condition being treated.
The Takeaway
Pigmentation across different skin tones is not simply a question of how many melanocytes someone has. The important differences involve melanin production, melanosome characteristics, pigment distribution, inflammatory response and sensitivity to different wavelengths of light. That is also why pigmentation should rarely be approached with a one-size-fits-all treatment plan.
Understanding the biology behind the pigment allows treatments to be selected more carefully, inflammation to be managed more thoughtfully and long-term pigment control to become the priority, not simply making a dark spot disappear as quickly as possible.
At MEOD Beauty & Aesthetics, our approach begins with understanding your individual skin biology before deciding how or whether to treat pigmentation.
*This article is for general educational purposes and does not replace an individual medical assessment.
