An optimal method for quantifying the facial sebum level and characterizing facial sebum features

Area of Science:

• Dermatology
• Biophysics
• Cosmetic Science

Background:

• Sebum content is crucial in skin conditions like acne.
• Quantifying facial sebum levels is challenging due to environmental influences.
• An optimal method for facial sebum quantification is proposed.

Purpose of the Study:

• To assess optimal methods for quantifying facial sebum levels.
• To evaluate the impact of measurement timing and site on sebum quantification.
• To determine the reliability of a single sebum measurement for assessing sebum excretion rate.

Main Methods:

• 460 participants (160 males, 300 females) aged 20-40 were enrolled.
• Sebumeter SM 810 used for measurements at five facial sites.
• Compared one-time vs. three consecutive measurements, and assessed sebum recovery after 1 hour of rest post-sebum removal.

Main Results:

• One-time sebum measurement effectively represented relative sebum levels.
• Sebum levels recovered to 70%-90% within 1 hour post-removal, validating Sebum Excretion Rate (SER) quantification.
• Cheeks showed the most stable sebum levels (CSL/SER) across testing points and times, with the nose having the highest and cheeks the lowest sebum content.

Conclusions:

• A single Casual Sebum Level (CSL) measurement 1 hour after sebum removal is adequate for determining sebum levels and SER.
• The cheeks are recommended as the optimal facial testing site for sebum measurement.
• Observed age-related differences in sebum levels varied between sexes and skin types.