# Vitiligo in the Digital Spotlight: Retrospective Longitudinal Study in Germany

## TL;DR

This study analyzed vitiligo-related web searches in Germany to understand public interest and medical needs, finding higher activity in summer and rural areas.

## Contribution

The study provides new insights into vitiligo's public interest and regional patterns using longitudinal web search data in Germany.

## Key findings

- Vitiligo-related searches peaked in summer and correlated with temperature and sunshine hours.
- Higher search rates were observed in Hamburg, Berlin, and Bremen compared to other regions.
- Rural areas showed higher search volume per 100,000 inhabitants than urban areas.

## Abstract

Vitiligo is a chronic skin disease with a global prevalence of approximately 1% to 2%, characterized by depigmented macules. Little is known about the public interest and medical needs of patients with vitiligo in Germany. However, understanding this is critical for a patient-centered holistic therapeutic management of the disease.

This study aimed to analyze vitiligo-related web search behavior across Germany as a proxy for public awareness. A retrospective longitudinal study was conducted using Google Ads Keyword Planner to collect monthly search volume data for vitiligo-related terms from October 2019 to May 2023.

Keywords were identified in the 7 most spoken languages in Germany (German, Turkish, English, Arabic, Russian, and Polish). Seasonal and regional variations were analyzed, along with correlations with population density, dermatologist availability, and weather patterns.

In total, 7,764,080 vitiligo-related searches were recorded. Most searches (n=5,808,360, 74.81%) addressed general information. Search volume peaked during the summer months and correlated positively with temperature and sunshine hours (P<.001). Notable regional differences were observed, with the highest search rates in Hamburg, Berlin, and Bremen. Rural areas showed higher search volume per 100,000 inhabitants than urban areas.

The findings suggest a strong public interest in vitiligo, particularly during periods of increased skin exposure. The high demand for treatment-related information further reflects the need for accessible, effective care. Web search behavior can offer real-time insights into public awareness and unmet needs, supporting earlier disease recognition, stigma reduction, and targeted educational strategies.