Ma L, et al. - Experts sought to reveal the biophysical properties and etiology of sensitive scalp. Taken together, disrupted barrier function, abnormal sebum amount and composition, along with perturbed microbiome (which might be the direct cause) were demonstrated in sensitive scalp. For treatment of sensitive scalp, help could be provided by products targeting these features. They noted increased sebum production in the sensitive scalp (SS) group at occiput. Compared to nonsensitive scalp (NS), amounts of free fatty acids, cholesteryl ester, and squalene were significantly higher in SS group. Moreover, a significantly higher percentage of Propionibacterium and lower bacterial diversity was seen in the SS.