Naturally if the acne is severe you will need to consult a dermatologist. Dermatitis is a skin condition from many different causes. An allergy can occur which is a reaction of the body to an irritating substance such as dust, plants, animals or pollen. Eczema is a swelling and redness of the skin that can include itching and blisters and is usually caused by an allergic reaction. Hives are bumps on the surface of the skin, usually caused by an allergic reaction to food or medicine.
Stress can cause hives.
Your dermatologist can prescribe medicines to relive the intense itching. Dermatitis can be caused when an irritating or harsh substance touches the skin. This is called contact dermatitis and is usually caused by clothing, perfumes, hair dyes, makeup, or detergents. Poison ivy rash is a form of contact dermatitis and itching and burning will occur. Usually this rash will disappear within three weeks.