ABSTRACT
Large-scale irritation tests for dermatologic and cosmetic products have been conducted on the back and arm. Like the face, the scalp is frequently a target of topical products, such as drugs and cosmetics. Yet, shampoos often contain potential irritants. The scalp may hide classical irritation morphology (erythema and edema). However, a few investigations documented the scalp’s structure and functions (1-3). In particular, data comparing reactions to surfactants between scalp and back and arm are limited.
