Pigmentary disorders constitute a diverse group of dermatological conditions characterized by alterations in the color of the skin due to abnormalities in melanin production, distribution, or degradation. These disorders broadly include hyperpigmentary, hypopigmentary, and depigmentary conditions, each with distinct etiologies and clinical manifestations. In recent years, pigmentary dermatoses have gained increasing attention due to their high prevalence, chronic course, and significant impact on patients’ quality of life, particularly in populations with darker skin types such as those in India. The visible nature of these conditions often leads to cosmetic concerns, psychological distress, and social stigma, making them an important public health issue beyond mere cutaneous pathology^1,2,3. 

India, with its predominantly Fitzpatrick skin types IV–VI, exhibits a unique spectrum of pigmentary disorders. The increased melanin content in darker skin not only predisposes individuals to pigmentary abnormalities but also makes these conditions more clinically apparent and cosmetically distressing. Studies conducted in Indian populations have demonstrated that pigmentary disorders form a substantial proportion of dermatology outpatient visits, particularly in urban tertiary care centers where patients seek specialized care. Environmental factors such as ultraviolet radiation exposure, genetic predisposition, hormonal influences, and cultural practices contribute to the higher prevalence and varied presentation of these disorders in the Indian context^4,5,6. 

Among the spectrum of pigmentary disorders, melasma, post-inflammatory hyperpigmentation (PIH), vitiligo, and pityriasis versicolor are consistently reported as the most common conditions encountered in tertiary care settings. Melasma, in particular, is highly prevalent among women of reproductive age and is associated with hormonal influences, sun exposure, and genetic susceptibility. Post-inflammatory hyperpigmentation frequently follows inflammatory dermatoses, acne, or trauma, and tends to be more persistent in darker skin types. Vitiligo, an acquired depigmentary disorder, represents a major clinical entity due to its chronicity and autoimmune basis, while superficial fungal infections such as pityriasis versicolor also contribute significantly to pigmentary alterations in tropical climates like India^7,8. 

Vitiligo, one of the most extensively studied pigmentary disorders, is an acquired condition characterized by the loss of functional melanocytes, resulting in depigmented macules and patches. It affects approximately 0.36% of the global population and is believed to have a multifactorial etiology involving autoimmune, genetic, oxidative stress, and neural mechanisms. Indian studies have highlighted that vitiligo often presents at a younger age, with a significant proportion of patients developing the disease in the second decade of life. The clinical patterns vary, with vitiligo vulgaris being the most common type, and disease progression is influenced by factors such as trauma, stress, and genetic predisposition^9,10,11,12. 

Hyperpigmentary disorders, particularly facial melanosis, are another major component of the clinical spectrum in Indian dermatology practice. Melasma is the most common cause of facial pigmentation, accounting for a significant proportion of cases seen in outpatient departments. Other conditions such as lichen planus pigmentosus, acanthosis nigricans, periorbital hyperpigmentation, and exogenous ochronosis also contribute to the burden of

hyperpigmentation. These disorders often have multifactorial etiologies, including metabolic, inflammatory, and environmental factors, and require careful clinical and dermoscopic evaluation for accurate diagnosis^13,14,15,16. 

The psychosocial impact of pigmentary disorders is profound and often underestimated. Due to the visible nature of these conditions, patients frequently experience anxiety, depression, reduced self-esteem, and impaired social interactions. Studies from tertiary care centers in India have shown that disorders such as vitiligo, melasma, and lichen planus pigmentosus are associated with significant impairment in quality of life, with measurable levels of psychological distress. The stigma associated with depigmentary conditions like vitiligo further exacerbates emotional burden, particularly in socio-cultural settings where skin appearance holds considerable importance^17,18. 

Urban tertiary teaching hospitals play a crucial role in the diagnosis, management, and research of pigmentary disorders. These centers serve as referral hubs, providing access to advanced diagnostic tools such as dermoscopy and histopathology, and facilitating comprehensive evaluation of patients. Hospital-based studies are particularly valuable in understanding the clinical spectrum, demographic distribution, and associated risk factors of pigmentary disorders in specific populations. Such data are essential for developing targeted management strategies and improving patient outcomes in diverse clinical settings^19,20,21. 

Despite the high prevalence and significant impact of pigmentary disorders, there remains a need for more region-specific epidemiological data, especially from urban tertiary care settings in India. Variations in lifestyle, environmental exposure, and genetic background across different regions necessitate localized studies to better understand disease patterns. Furthermore, evolving diagnostic modalities and therapeutic options underscore the importance of continuous research in this field. Understanding the clinical spectrum of pigmentary disorders not only aids in accurate diagnosis and effective treatment but also helps address the psychosocial aspects associated with these conditions²². 

In this context, the present study aims to evaluate the clinical spectrum of pigmentary disorders in Indian patients attending an urban tertiary teaching hospital. By analyzing the prevalence, demographic characteristics, and clinical patterns of these disorders, the study seeks to contribute to the existing body of knowledge and provide insights for improved clinical management and future research directions in pigmentary dermatology. 

Sample Size and Study Area

A total of 450 patients attending the dermatology outpatient department (OPD) were enrolled in this study. The study was carried out over a period of twelve months, from May 2023 to April 2024.

Inclusion Criteria

All patients, irrespective of age and gender, who attended the dermatology OPD during the study period were considered eligible for inclusion.

Exclusion Criteria

Patients who declined to provide informed consent for participation were excluded from the study.

Ethical Considerations

Approval was obtained from the Institutional Ethics Committee prior to initiation of the study, adhering to standard ethical guidelines. Written informed consent was secured from all participants before their inclusion.

Data Collection

After enrollment, detailed demographic data such as age, gender, occupation, average daily sun exposure, family history of pigmentary disorders, use of oral contraceptive pills, and application of skin-lightening products were recorded. A comprehensive clinical history was obtained, including details regarding onset, duration, progression, and distribution of lesions. Each patient underwent a thorough dermatological examination, supported by dermoscopic evaluation where required. Parameters such as lesion size, color, extent, and associated systemic or cutaneous findings were carefully assessed to establish the diagnosis.

Statistical Analysis

Data were analyzed using SPSS software (version 17.0 for Windows). Categorical variables were expressed as frequencies and percentages, while continuous variables were presented as mean ± standard deviation (SD). Data normality was evaluated prior to analysis. Fisher’s exact test was applied for categorical variables, and the unpaired t-test was used for comparison of continuous variables, depending on their distribution.

Demographic Characteristics A total of 450 patients attending the dermatology OPD of Hinduhridayasamrat Balasaheb Thackeray Medical College and Dr. R. N. Cooper Municipal General Hospital, Mumbai, were included in the study. The mean age of participants was 38.2 years (SD ± 9.5), ranging from 18 to 65 years. Females constituted the majority with 270 patients (60%), while males accounted for 180 patients (40%). Regarding occupation, 203 patients (45.1%) were professionals, 135 patients (30%) were homemakers, and 112 patients (24.9%) were students or unemployed. The average daily duration of sun exposure was 4.3 hours (SD ± 1.4). Table 1: Demographic Profile of the Study Population (n = 450) Demographic Characteristic Frequency Percentage (%) Age (Mean ± SD) 37.5 ± 9.2 Age Range 18–65 Female 270 60 Male 180 40 Professionals 203 45 Homemakers 135 30 Students/Unemployed 112 25 Sunlight Exposure (hours/day) 4.2 ± 1.3 Table 2: Prevalence of Pigmentary Disorders (n = 450) Pigmentary Disorder Frequency Percentage (%) Melasma 158 35 Postinflammatory Hyperpigmentation 113 25 Vitiligo 90 20 Pityriasis Alba 45 10 Lichen Planus Pigmentosus 22 4.9 Pigment Contact Dermatitis 22 4.9 Table 3: Clinical Presentation Pigmentary Disorder Clinical Presentation (%) Melasma Malar Region (70) Postinflammatory Hyperpigmentation Face (60), Extremities (40) Vitiligo Face (40), Hands (30), Trunk (30) Pityriasis Alba Face (80), Arms (20) Lichen Planus Pigmentosus Face (60), Neck (40) Prevalence of Pigmentary Disorders Among the 450 patients evaluated, melasma was the most prevalent pigmentary disorder, affecting 158 individuals (35.1%), followed by post-inflammatory hyperpigmentation in 113 patients (25.1%). Vitiligo accounted for 90 cases (20%), while pityriasis alba was observed in 45 patients (10%). Less common conditions included lichen planus pigmentosus and pigment contact dermatitis, each affecting 22 patients (4.9%). Overall, melasma clearly emerged as the dominant clinical entity in this cohort. Clinical Presentation The clinical manifestations varied depending on the specific disorder. Melasma most commonly involved the malar region, seen in approximately 111 patients (70%). Postinflammatory hyperpigmentation predominantly affected the face in 68 patients (60%) and the extremities in 45 patients (40%). Vitiligo presented as well-defined depigmented macules, most frequently distributed over the face (36 patients; 40%), hands (27 patients; 30%), and trunk (27 patients; 30%). Pityriasis alba typically appeared as hypopigmented, mildly scaly patches, mainly on the face (36 patients; 80%) and arms (9 patients; 20%). Lichen planus pigmentosus was characterized by hyperpigmented lesions, commonly involving the face (13 patients; 59.1%) and neck (9 patients; 40.9%). Associated Factors Several contributing factors were identified among the study population. A positive family history of pigmentary disorders was present in 135 patients (30%), suggesting a genetic predisposition. The use of oral contraceptive pills was reported by 113 patients (25.1%), indicating a possible hormonal influence. Additionally, regular application of skin-lightening creams was noted in 90 patients (20%), highlighting the role of cosmetic practices in the development or exacerbation of pigmentary conditions. Statistical Analysis Statistical evaluation revealed meaningful associations between demographic variables and pigmentary conditions. Fisher’s exact test demonstrated a significant association between family history and melasma (p < 0.05). Additionally, the unpaired t-test indicated a statistically significant difference in mean sun exposure duration between patients with and without vitiligo (p < 0.01).

Pigmentary disorders constitute a significant proportion of dermatological conditions in Indian populations, largely due to genetic predisposition, increased ultraviolet exposure, and sociocultural practices. The present study provides a comprehensive overview of the epidemiological and clinical spectrum of pigmentary disorders in a tertiary care setting and compares these findings with recent literature.

In the present study, melasma (35.1%) emerged as the most common pigmentary disorder, followed by post-inflammatory hyperpigmentation (25.1%), vitiligo (20%), and pityriasis alba (10%). These findings are consistent with the study by Pakhare et al. (2024), which also reported melasma as the most frequently encountered pigmentary disorder in Indian patients attending a tertiary care hospital.  The high prevalence of melasma can be attributed to chronic sun exposure, hormonal influences, and genetic susceptibility, all of which are welldocumented in recent global research trends. 

The female predominance (60%) observed in this study aligns with previous studies, where melasma and other hyperpigmentation disorders are more common among women due to hormonal factors, including pregnancy and oral contraceptive use. Similar gender distribution has been reported in multiple Indian and global studies, reinforcing the role of estrogen and progesterone in melanogenesis.

The mean age (38.2 years) in our study corresponds with findings from other studies, which indicate that pigmentary disorders, particularly melasma, are most prevalent in the third to fifth decades of life. This age group is more exposed to environmental triggers such as ultraviolet radiation and occupational stress, contributing to disease onset and progression.

Post-inflammatory hyperpigmentation (25.1%) was the second most common condition in our study. This is in agreement with global epidemiological data, where post-inflammatory hyperpigmentation is frequently observed, particularly in darker skin types due to increased melanocyte reactivity. 

Vitiligo accounted for 20% of cases in our study, which is relatively higher compared to global prevalence estimates but similar to hospital-based Indian studies. Vitiligo is recognized as an autoimmune condition with significant psychosocial implications, especially in individuals with darker skin tones.The higher proportion observed in our study may be due to referral bias in tertiary care centers.

In terms of clinical presentation, malar involvement in melasma (70%) was the most common pattern, consistent with earlier studies that identify the malar pattern as the predominant clinical type. Similarly, the distribution of vitiligo lesions over the face, hands, and trunk observed in our study mirrors classical descriptions in dermatological literature.

The role of associated factors such as family history (30%), oral contraceptive use (25.1%), and use of skin-lightening creams (20%) was notable in our study. These findings are comparable with previous research, which highlights genetic predisposition and exogenous triggers as key contributors to pigmentary disorders. The widespread use of cosmetic products and over-the-counter depigmenting agents in India further exacerbates these conditions.

Statistically, a significant association between family history and melasma (p < 0.05) was observed, supporting the genetic basis of pigmentary disorders. Additionally, the significant relationship between sunlight exposure and vitiligo (p < 0.01) underscores the role of environmental triggers in disease exacerbation. These findings are in agreement with prior studies emphasizing multifactorial etiology involving genetic, environmental, and hormonal factors.

Overall, the findings of the present study are largely consistent with existing literature, thereby reinforcing current knowledge regarding the epidemiology and clinical patterns of pigmentary disorders in Indian populations.

Table 4: Comparative Table of Present Study with Recent Studies

The findings of the present study are largely in agreement with recent national and international research, particularly in identifying melasma as the most common pigmentary disorder, along with a clear female predominance and greater involvement of individuals in the middle-age group. The study also reinforces the significant contribution of sunlight exposure and genetic predisposition in the development of these conditions, as well as the substantial burden of postinflammatory hyperpigmentation observed in individuals with darker skin types. Minor differences, such as a relatively higher proportion of vitiligo cases, may be explained by the tertiary care hospital setting and the possibility of referral bias. Overall, these observations support existing evidence and underscore the importance of implementing targeted preventive strategies, with a strong emphasis on sun protection and increasing awareness regarding the safe use of cosmetic products.

Limitations

This study has certain constraints that should be acknowledged while interpreting the findings. Its cross-sectional nature restricts the ability to infer causal associations or establish the sequence of events between risk factors and outcomes. The dependence on self-reported information introduces the possibility of recall bias, which may affect data accuracy. Moreover, as the study was carried out in a single urban tertiary care teaching institution, the findings may not be fully representative of broader populations or different healthcare settings.

Future Directions

Further research should focus on overcoming these limitations by employing longitudinal designs that can better evaluate causal relationships and disease progression over time. The use of objective assessment tools for pigmentary changes would improve data reliability. Investigations into genetic predisposition and relevant biomarkers may provide deeper insights into the pathophysiology of pigmentary disorders and support the development of targeted therapies. In addition, large-scale, multicenter studies including diverse demographic groups are recommended to enhance the generalizability and comprehensiveness of future findings.