# The Kesty Redness Scale: A Pilot Validation Study for a Novel Tool for Evaluating Facial Redness in Cosmetic and Clinical Dermatology

## TL;DR

The paper introduces and validates a new tool called the Kesty Redness Scale for measuring facial redness in dermatology.

## Contribution

The novel contribution is the development and validation of the Kesty Redness Scale for assessing facial redness.

## Key findings

- The Kesty Redness Scale was rated as reliable and easy to use by investigators.
- Statistical analyses confirmed strong agreement and validity of the KRS for measuring facial redness.
- The tool is proposed for use in clinical practice and research to document patient characteristics.

## Abstract

Facial redness is a common concern in dermatology, affecting patients with conditions such as rosacea, post‐inflammatory erythema, and other vascular irregularities. Despite its prevalence, existing tools for quantifying facial redness are limited in their clinical utility and ease of use.

To develop a high‐performing redness scale.

This study introduces the Kesty Redness Scale (KRS), outlines its development and validation process, and discusses its potential clinical applications.

The investigators rated the scale as useful and easy to use, and the majority stated they would use it in clinical practice to document patient characteristics. The results of the evaluation utilizing Gwet's AC2, Kendall's W, Spearman's ρ, Weighted Cohen's kappa, and Bland–Altman analysis —showcasing strong ordinal agreement, robust rank concordance, and negligible bias—demonstrate that this new rating system is both reliable and valid for measuring skin hyperpigmentation on a 0–3 scale.

The KRS is a reliable, easy‐to‐use tool that enhances the assessment of facial redness in dermatology. Its validation through expert evaluation and statistical analysis underscores its potential to improve clinical practice and research.