Hair care and skin care have long been distinctly separate personal care categories, but there is more overlap between them than one may immediately realize. A recent case report shows that leading hair care products can leave residue on skin for hours post-shower. In this study, shampoo and conditioner left a residue on the scalp, face, and back for up to two hours after use, and leave-in styling products left a residue on skin for up to four hours.1 THE HAIR CARE LINK The relationship between hair care products and skin is important because hair care products are not typically formulated with skin in mind. These products can actually contribute to skin issues, including acne, eczema, reactive skin, and a dry or flaky scalp. Want to read more? Subscribe to continue reading this article, plus gain access to all DERMASCOPE has to offer. SUBSCRIBE References Rubin, IK, Gourion-Arsiquaud S. Deposition and retention of hair care product residue over time on specific skin areas. J Drugs Dermatol 2020;19:419-423 Rubin IK. Efficacy of a Non-Comedogenic Hair Care Regimen for the Reduction of Mild-to-Moderate Truncal and Facial Acne: A Single-Arm 8-Week Study. J Drugs Dermatol 202;20:690-693. 3. Warshaw EM, Schlarbaum JP, Silverberg JI et al. Contact dermatitis to personal care products is increasing (but different!) in males and females: North American Contact Dermatitis Group data, 1996-2016. J Am Acad Dermatol 2021;85:1446-1455. 4. Pham CT, Juhasz M, Lin J et al. Allergic Contact Dermatitis of the Scalp Associated With Scalp Applied Products: A Systematic Review of Topical Allergens. Dermatitis 2022; 33:235.248. Want to read more? Subscribe to one of our monthly plans to continue reading this article.