Table 2: The skin surface lipid (SSL) composition (%) and total lipid content in adult healthy subjects and in adult patients suffering from seborrheic dermatitis (HIV-negative and HIV-positive) and atopic dermatitis (according to [29, 30]).

Lipid FractionGroups
Healty subjects (n=30)Seborrheic dermatitis (n=30)Seborrheic dermatitis (HIV positive) (n=30)Atopic dermatitis (n=20)

Squalene (SQ)12.8 ± 0.611.7 ± 0.9*11.5 ± 1.0*10.8 ± 1.1*
Cholesterol esters (CE)1.3 ± 0.21.0 ± 0.41.8 ± 0.5*2.4 ± 0.6*
Wax esters (WE)25.6 ± 3.223.9 ± 5.123.8 ± 4.521.7 ± 1.8*
Triglycerides (TG)36.1 ± 8.440.7 ± 10.342.3 ± 10.232.6 ± 10.6
Free fatty acids (FFA)21.6 ± 8.818.9 ± 9.617.4 ± 10.528.8 ± 11.4
Cholesterol (CH)1.2 ± 0.21.7 ± 0.5*1.7 ± 0.5*2.4 ± 0.4*
Diglycerides (DG)1.4 ± 0.21.2 ± 0.21.5 ± 0.21.3 ± 0.2
TOTAL LIPIDS (μg/cm2)195.4 ± 20.6171.2 ± 29.7*167.2 ± 30.4*172.6 ± 17.4*

SSL sampled from the forehead, with diethyl ether cup extraction method [30]. Results are expressed as mean ± S.D.
*Significance level versus healthy subjects at P<.05.