September 2014 in “International Journal of Dermatology and Venereology” Certain histamine receptors (H2R, H3R, H4R) have unique roles in treating skin diseases, with H2R helping with chronic urticaria and other conditions, H3R providing pain relief and allergy benefits, and H4R reducing inflammation and itchiness.
January 1978 in “Yukagaku” Zinc pyrithione in shampoo or rinse reduces dandruff and itching.