Hyperpigmentation ranks among the most frequent reasons for dermatology clinic visits. In countries such as Turkey, where Fitzpatrick types III–IV predominate, melanocyte activity is more reactive, making pigmentation treatment both more challenging and associated with a higher risk of post-inflammatory hyperpigmentation. At Virtuana Clinic in Izmit/Kocaeli, we offer accurate pigmentation diagnosis and treatment through Wood lamp assessment, dermoscopy, and individualized combination protocols.
Hyperpigmentation Classification: Determining Lesion Depth
The skin layer in which the lesion resides directly determines the treatment approach and the likelihood of success. There are three fundamental depth categories:
- Epidermal hyperpigmentation: Melanin is located at the stratum basale and spinosum level. Under the Wood lamp, marked contrast enhancement is observed (the lesion appears darker than under white light). The best treatment response is obtained from this group.
- Dermal hyperpigmentation: Melanin has accumulated in melanophages within the dermis. No contrast enhancement under the Wood lamp. Response to all treatments, including laser, is limited.
- Mixed type: Pigment is present in both layers. Partial contrast enhancement under the Wood lamp. The epidermal component responds to treatment while the dermal component remains resistant. Melasma most commonly belongs to this group.
Types of Hyperpigmentation: Comprehensive Comparison Table
| Lesion Type | Location | Borders | Trigger | Depth | Treatment Response |
|---|---|---|---|---|---|
| Melasma | Cheeks, forehead, upper lip, nasal bridge | Irregular, geographic | UV, pregnancy, oral contraceptives, thyroid | Mixed (most commonly) | Moderate; prone to relapse |
| PIH | Overlaps site of inflammation | Irregular or oval | Acne, laser, peeling, injury | Usually epidermal | Good (slower in darker skin) |
| Solar Lentigo | Sun-exposed areas (face, back of hands, décolletage) | Regular, well-defined | Chronic UV exposure | Epidermal | Very good (laser and cryotherapy) |
| Ephelides (Freckles) | Face, neck, shoulders | Small, well-defined | Genetic (MC1R), UV | Epidermal | Good; may fade in winter |
| Seborrhoeic Keratosis | Trunk, face, temporal area | Regular, stuck-on appearance | Ageing, genetic | Epidermal + keratinocyte proliferation | Good (cryotherapy/laser) |
| Lichen Planus Pigmentosus | Forehead, temporal area, neck folds | Diffuse, ill-defined | Idiopathic, UV, irritant substances | Dermal | Poor; most resistant type |
The Importance of the Wood Lamp Test
The Wood lamp (365 nm UVA) is the first-line diagnostic tool for assessing the depth of melanin deposition. During examination in a darkened room:
- Enhanced lesion (contrast increase): Epidermal melanin — good response to topical treatment is expected.
- Non-enhanced lesion (no contrast): Dermal melanin — limited treatment response; a prolonged course.
- Partial enhancement: Mixed type — the standard melasma scenario.
The Wood lamp test predicts lesion depth with 75–80% accuracy; dermoscopy or, in rare cases, biopsy may be added for definitive classification.
Treatment Response and PIH Risk by Fitzpatrick Skin Type
| Fitzpatrick Type | Skin Colour | Melanocyte Reactivity | PIH Risk | Laser Safety |
|---|---|---|---|---|
| Type I–II | Fair, burns easily | Low | Low | High; aggressive protocols applicable |
| Type III | Medium olive | Moderate | Moderate | Good; protocol optimisation required |
| Type IV | Olive to light brown (Turkish average) | High | High | Nd:YAG or low-energy protocol |
| Type V–VI | Dark brown to black | Very high | Very high | Limited; topical pre-treatment mandatory |
When Is Biopsy Indicated?
In the evaluation of hyperpigmentation, biopsy is indicated in the following situations:
- The clinical appearance of the lesion does not fit the typical hyperpigmentation picture
- Asymmetry, irregular borders, or colour heterogeneity are present (suspicion of melanoma)
- Growth continues despite topical treatment
- Suspicion of pigmentation secondary to a systemic disease such as lichen planus pigmentosus or amyloidosis
- The patient requests biopsy for any form of reassurance
Treatment Approach Algorithm
The hyperpigmentation treatment algorithm applied at Virtuana Clinic is based on four variables:
- Lesion type is identified (clinical examination + Wood lamp + dermoscopy if required)
- Depth classification is established (epidermal / dermal / mixed)
- Fitzpatrick type is determined (PIH risk is assessed)
- Treatment is selected:
- Epidermal + Fitzpatrick I–III: Topical depigmenting agents + chemical peeling + IPL/Q-switched laser
- Epidermal + Fitzpatrick IV–VI: Topical pre-treatment (4–8 weeks) + gentle peeling + Nd:YAG laser
- Mixed (melasma): Combination topical therapy (hydroquinone 2–4% + tretinoin + steroid — Kligman's formula or alternatives) + oral/topical tranexamic acid + mandatory SPF + very cautious peeling
- Dermal type: Long-term topical treatment; limited expectations with laser; tranexamic acid + niacinamide support
The Most Treatment-Resistant Type: Dermal Melasma
Dermal and mixed melasma require the longest and most challenging treatment course among all types of hyperpigmentation. Why is it so resistant?
- Melanin is deposited in melanophages deep in the dermis; topical agents cannot reach it.
- UV damage permanently reprogrammes melanocytes; relapse is inevitable as long as the trigger persists.
- Aggressive laser treatment increases PIH risk, necessitating energy restriction.
- When hormonal triggers (pregnancy, oral contraceptives) cannot be controlled, treatment response is limited.
A realistic expectation for dermal melasma: 30–50% lightening may be achieved; complete resolution is rare. Treatment yields no meaningful result without year-round protective SPF use and elimination of triggers.
Combination Treatment Protocol
A single treatment modality is rarely sufficient for hyperpigmentation. Virtuana Clinic's standard combination protocol:
- At home (morning): Niacinamide 5% + SPF 50+ mineral-filter sunscreen
- At home (evening): Azelaic acid 15–20% or tranexamic acid 5% + retinol (once tolerance is established)
- In-clinic (monthly): Mandelic acid peel 30–40% for melasma/PIH; Q-switched Nd:YAG (1064 nm) or IPL for solar lentigo
- Mesotherapy add-on: Intradermal infusion of tranexamic acid + vitamin C + glutathione cocktail (3–4 sessions)
Frequently Asked Questions
Does melasma go away completely? Complete resolution is rare; in cases with a dermal component in particular, long-term control is the target. Relapse is inevitable without UV protection.
Is laser treatment suitable for every type of pigmentation? No. In Fitzpatrick IV–VI skin types, an inappropriate laser choice can cause pigmentation to darken. Device and energy selection must be made by a specialist.
Why does dark discolouration remain after acne clears? This is PIH (post-inflammatory hyperpigmentation) and originates from melanocytes stimulated during the inflammatory process. It resolves within a few months with topical depigmenting agents and SPF.
This article is for informational purposes only. Please consult a qualified physician for treatment decisions.