[Patch testing with sodium lauryl sulfate: benefits and drawbacks in research and practice]

Area of Science:

• Dermatology
• Skin Physiology
• Toxicology

Background:

• Sodium lauryl sulfate (SLS) patch testing is a common method to evaluate skin irritation.
• Assessing SLS test results can be done visually or using bioengineering techniques.

Purpose of the Study:

• To evaluate the utility and interpretation of the sodium lauryl sulfate (SLS) patch test for assessing skin irritation.
• To highlight the role of bioengineering methods in conjunction with visual assessment.

Main Methods:

• Visual evaluation of skin reactions.
• Bioengineering measurements including transepidermal water loss (TEWL), laser Doppler flowmetry, colorimetry, and corneometry.
• Consideration of influencing factors like age, test site, and climate.

Main Results:

• Transepidermal water loss (TEWL) is the most appropriate bioengineering method for SLS testing.
• Laser Doppler flowmetry, colorimetry, and corneometry can provide supplementary data.
• Factors such as age, test area, and climate can affect SLS test outcomes.

Conclusions:

• The SLS patch test, when used correctly, provides crucial information on skin susceptibility to irritation.
• Overreliance on objective bioengineering measurements alone should be avoided; they define phenomena but not causation.
• Integrating visual and bioengineering data ensures a comprehensive understanding of skin irritation responses.