Facial dermatosis associated with Demodex: a case-control study

Area of Science:

• Dermatology
• Parasitology
• Epidemiology

Background:

• The association between Demodex mites and various skin disorders remains debated.
• Facial dermatosis prevalence and Demodex infestation require further investigation.

Purpose of the Study:

• To investigate the association between facial dermatosis and Demodex infestation.
• To identify risk factors for Demodex infestation in dermatosis patients.

Main Methods:

• A case-control study involving 860 dermatosis patients in Xi'an, China.
• Demodex mites were sampled using the skin pressurization method.
• Multivariate regression analysis was employed to assess associations and risk factors.

Main Results:

• The overall Demodex detection rate was 43.0%.
• Increased odds of Demodex infestation were observed in individuals over 30 and those with mixed, oily, or dry skin.
• Demodex infestation showed significant associations with rosacea, steroid-induced dermatitis, seborrheic dermatitis, and primary irritation dermatitis, with severe infestations yielding higher odds ratios.

Conclusions:

• Demodex infestation is significantly associated with rosacea, steroid-induced dermatitis, seborrheic dermatitis, and primary irritation dermatitis.
• Severe Demodex infestation is more strongly correlated with dermatosis than overall infestation.
• Age and skin type are identified as risk factors for Demodex infestation, and improved hygiene may reduce demodicosis prevalence.