# Reflectance spectroscopy: a non-invasive strategy to explore skin reactions to topical products

## TL;DR

Reflectance spectroscopy is a non-invasive method to study skin reactions to topical products by analyzing reflected light.

## Contribution

The paper reviews how reflectance spectroscopy can quantify skin properties and predict diseases non-invasively.

## Key findings

- Reflectance spectroscopy can measure erythema index and melanin content.
- It helps monitor skin physiology changes and long-term effects of topical products.
- The technique supports personalized solutions for dermatological care.

## Abstract

Reflectance spectroscopy has emerged as a powerful analytical technique in the field of dermatology, offering a non-invasive strategy to assess several cutaneous properties and skin response to topical products. By analyzing reflected light across different wavelengths, reflectance spectroscopy allows the quantification of cutaneous parameters, such as erythema index and melanin content. Moreover, this analytical technique enables the monitoring of any changes in skin physiology facilitating the assessment of long-term effects of topical products as well as predicting cutaneous diseases. This review provides an overview of the application of reflectance spectroscopy in investigating skin properties and reaction to topical applied products, including both pharmaceutical and cosmetic formulations, thereby aiding in the development of personalized solutions tailored to individual needs.