Skin Allergy

There are many types of itchy skin allergies and rashes. However, not all rashes that itch are related to skin allergies. The following are the most common types of allergic skin rashes.

Atopic Dermatitis (Eczema)
Atopic dermatitis frequently occurs in young children, although may start in young adults, and can continue into adult life. The rash of atopic dermatitis, often called eczema, occurs where a person scratches. In infancy, the rash occurs on the chest, cheeks and scalp, where the child is able to scratch. Older children and adult typically have the rash in the skin folds of the elbows and behind the knees, although may also occur on the face, neck, hands, feet and back.
The rash is red, often flakes or oozes, and has small blisters or bumps. There are often excoriations, or areas of broken skin, from aggressive scratching.

Urticaria (Hives) and Angioedema (Swelling)

Urticaria, commonly called hives, is an itchy rash that can occur at any age. This rash appears as raised red bumps of various shapes and sizes, and typically lasts for only minutes to hours. While it can be very itchy, a person will generally not excoriate (scratch to the point of breaking the skin and cause bleeding) themselves.

The swelling that sometimes goes along with urticaria is called angioedema, and often involves the lips, the eyes, and the hands and feet. Angioedema is usually not itchy or red, it tends to burn, sting or cause a tingling sensation. Severe swelling that blocks the ability to breathe can be dangerous and even life-threatening

Itching Without a Rash

It is a relatively common problem for people to have itching without a rash being present. The medical term for itching is pruritus, and this symptoms can represent a skin problem, or even an internal disease within the body. When the itching is limited to a certain area of the body, the most likely reason is a disease process limited to the skin. The area of the body that itches often gives a big clue as to the cause of the itching.
Pruritus the involves the entire body may still represent a disease of the skin, or may be caused by metabolic problems such as thyroid disease or iron deficiency. Many medications can cause itching, particularly pain medications like codeine and morphine.

Itching Without a Rash

It is a relatively common problem for people to have itching without a rash being present. The medical term for itching is pruritus, and this symptoms can represent a skin problem, or even an internal disease within the body. When the itching is limited to a certain area of the body, the most likely reason is a disease process limited to the skin. The area of the body that itches often gives a big clue as to the cause of the itching.

Pruritus the involves the entire body may still represent a disease of the skin, or may be caused by metabolic problems such as thyroid disease or iron deficiency. Many medications can cause itching, particularly pain medications like codeine and morphine.