The effect of local change in forehead skin temperature on both surface lipid composition and sebum excretion rate was studied in thirty‐six subjects. The sebum excretion rate varied directly with local temperature change so that a change in temperature of 1° C produced a change in the sebum excretion rate of the order of 10%. Significantly less squalene was detected in surface lipid when forehead temperature was decreased but no other temperature dependent variations in the composition of surface lipid were observed.
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Williams et al. (1973) studied this question.
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