Scratching the skin primes the gut for allergic reactions to food, mouse study suggests

Scratching the skin triggers a series of immune responses culminating in an increased number of activated mast cells — immune cells involved in allergic reactions — in the small intestine, according to research conducted in mice. This newly identified skin-gut communication helps illuminate the relationship between food allergy and atopic dermatitis (a type of eczema), a disease characterized by dry, itchy skin.