Melasma is a common form of facial hyperpigmentation characterised by symmetrical, irregularly bordered patches of increased pigmentation. While it is often discussed as a single condition, melasma is clinically and histologically diverse. Understanding its different types is essential, as both the distribution of pigmentation and the depth of pigment within the skin significantly influence prognosis and treatment outcomes.

Clinical Pattern: Where Melasma Appears

Melasma is classified into distinct types based on its anatomical distribution on the body.

Centrofacial Melasma

This is the most common presentation. It typically involves the forehead, cheeks, nose, upper lip, and chin. Its widespread distribution across central facial features often makes it the most noticeable and cosmetically concerning type.

Malar Melasma

Malar melasma is more localised, affecting the cheeks and the nose. This pattern is frequently seen in individuals with sun exposure concentrated on the mid-face.

Mandibular Melasma

This type presents along the jawline and chin. It is more commonly observed in older individuals and is often associated with cumulative sun damage.

Extrafacial Melasma

A less common variant, extrafacial melasma affects areas beyond the face, including the neck, sternum, forearms, and upper chest. This type may be linked to chronic environmental exposure and, in some cases, hormonal influences.

Depth of Pigment: Why It Matters

Beyond location, melasma is further classified based on how deeply pigment is deposited within the skin. This classification is critical, as it directly impacts treatment responsiveness.

Epidermal Melasma

Pigment is located in the upper layers of the skin. It often appears more defined under Wood’s lamp examination and typically responds well to topical depigmenting agents.

Dermal Melasma

Pigment is located deeper in the dermis and involves pigment-containing cells known as melanophages. This type is more resistant to treatment and often slower to improve.

Mixed Melasma

Mixed melasma includes both epidermal and dermal pigment. It is common in clinical practice and shows variable response to treatment depending on the dominant component.

Indeterminate Melasma

In this type, the depth cannot be clearly classified. It is more common in darker skin types or complex presentations and requires careful clinical assessment.

Diagnostic Tools and Their Role

Accurate classification of melasma type relies on a combination of diagnostic techniques.

Wood’s lamp examination helps differentiate between epidermal, dermal, mixed, and indeterminate types by enhancing pigment contrast.

Dermoscopy allows visualisation of pigment patterns, colour variation, and network structures, which supports assessment of pigment depth.

Reflectance confocal microscopy and photoacoustic microscopy provide high-resolution imaging to assess pigment depth and identify additional features such as vascular involvement.

Emerging Insights: The Role of Vascular Changes

Recent advances suggest that melasma is not solely a pigmentary disorder. Photoacoustic microscopy has introduced refined subtypes based on both pigment depth and vascular involvement.

These include epidermal pigment only, epidermal pigment with vascular changes, mixed pigment, and mixed pigment with vascular involvement. Increased dermal blood vessels may contribute to the persistence of melasma and may influence treatment strategies in resistant cases.

Why Correct Classification Is Essential

Identifying the specific type of melasma has direct clinical relevance. It helps predict treatment response, guides therapy selection, supports realistic patient expectations, and informs long-term management planning.

Take Home Message

Melasma is a condition I see very frequently when doing facials and treatments and also teaching, and while it is medically benign, it can be really bothersome and distressing for many individuals due to its impact on facial appearance and confidence. It is a multifactorial and heterogeneous condition best understood through its clinical distribution and the depth of pigmentation. Clinical patterns include centrofacial, malar, mandibular, and extrafacial types. Histological classification includes epidermal, dermal, mixed, and indeterminate forms. Emerging imaging techniques add further refinement by identifying vascular involvement.

Accurate classification is fundamental to optimising treatment outcomes and improving long-term management of this chronic and often recurrent condition.

Medical Disclaimer

This article is intended for educational and informational purposes only and does not constitute medical advice, diagnosis, or treatment. Melasma is a complex dermatological condition, and individual cases may vary. Always consult a qualified healthcare professional or dermatologist for personalised assessment and treatment recommendations.

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