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.

Researchers have demonstrated in cell cultures that salt leads to the formation of Th2 cells. These immune cells are active in allergic conditions such as atopic dermatitis. The team also detected elevated salt concentrations in the skin of patients.

Scientists have found that children with both atopic dermatitis and food allergy have structural and molecular differences in top layers of skin near the eczema lesions, whereas children with atopic dermatitis alone don't. Defining these differences may help identify children at risk for developing food allergies.

Many factors can cause the skin on the penis to peel, including chafing, allergic reactions, skin conditions, and infections. Learn about the causes of penis skin peeling and how to treat it here.

Don’t confuse allergies with a head cold.

Bleeding nipples may occur as a result of breastfeeding, skin irritation, allergies, and infections. Treatment depends on the underlying cause. Learn more about the causes of bleeding nipples here.

Many people are allergic to shellfish. The symptoms can be mild or severe and may include wheezing, coughing, and confusion. Learn more about the symptoms of a shellfish allergy here.

Researchers revealed that the immune cells basophils caused emphysema in mice with COPD-like features induced by intranasal administration of elastase. They showed that basophils, previously linked mainly to allergies and fighting parasites, initiated a cascade of reactions eventually leading to the release of excess MMP-12 and the destruction of alveolar walls. The team hopes that the findings will lead to breakthroughs in the treatment of COPD.

Many factors can cause a chronic sore throat, including allergies, smoking, and infections. In this article, we explore the possible causes and describe when to see a doctor.