Prevalence of sensitive skin and its biophysical response in a Mexican population

Figure 1 Relationship between the lactic acid stinging test response and self-diagnosis of sensitive skin in study subjects. Of the 246 subjects, 128 were positive and 118 were negative for the test. Bars represent the proportion of subjects with self-diagnosis of sensitive (n = 89) and non-sensitive skin (n = 157) and their results to the test. χ² test, ^aP < 0.05 vs positive for the test.

Figure 2 Relationship between skin phototype and lactic acid stinging test response. Subjects with lighter skin phototypes were more prone to display a positive response to lactic acid stinging test (84%), than subjects with the darker skin phototype in the sample population (40%). χ² test, ^aP < 0.05 vs positive for the test.

Figure 3 Differences in the skin biophysical response between those that were positive (n = 128) or negative (n = 118) to LAST. A: a* values, in arbitrary units; B: Transepidermal water loss, in g/m² per minute; C: Capacitance, in arbitrary units. Bars represent the mean and error bars represent the standard deviation. Mann-Whitney U test, ^aP < 0.05 vs positive for the test.