Dermal group 2 innate lymphoid cells in atopic dermatitis and allergy.

Type 2 immune responses in the skin cause a variety of pathologies, including urticaria and atopic dermatitis. Traditionally, CD4(+) helper T cells have been implicated in the pathogenesis of these conditions. However, recently a new player, the group 2 innate lymphoid (ILC2) cell, has emerged as an important contributor to skin allergies. In this review, we summarize our current knowledge of the role ILC2 cells play in the physiology and pathology of mouse and human skin.