Skin rashes can have many different ... Opioids cause the body to release histamine, which can trigger allergic reactions ...

“I got on the bus back and thought I could make it home, but I started feeling really faint, and my whole face ... allergic reaction to cold. "It is a rare condition that results in rashes ...

An armpit rash is often caused by irritation from sweat ... of substance irritates your skin, damaging its outermost layer. It is due to irritation, not an allergy. Bunick says common causes ...

Aquagenic urticaria is a rare condition where people have an allergic ... a type of itchy rash — develop rapidly after the skin comes into contact with water, including sweat or tears.

There are many possible reasons why a rash develops on the neck, including allergies, infections, insect bites, and skin conditions. Knowing what's causing your rash before treating it is important.