Scalp

    October 2014 in “ CRC Press eBooks ”
    Monica Huynh, Michael P. Sheehan, Michael T. Chung, Matthew Zirwas, Steven R. Feldman
    TLDR The scalp is usually protected from dermatitis but can react to hair products, especially tea tree oil and Minoxidil.
    The scalp's thicker skin and abundant pilosebaceous units made it a strong barrier against contact dermatitis, often remaining unaffected even when the face, ears, and neck were involved. Scalp dermatitis was more commonly linked to "scalp-applied" irritants and allergens, with hair dyes, cleansing products, and medicaments accounting for nearly two-thirds of positive patch test reactions. The rinse-off or drip pattern sign helped identify scalp-applied allergens. Tea tree oil emerged as a frequent allergen, and Minoxidil was noted as a common cause of scalp dermatitis medicamentosa.
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