Hives also called urticaria is a common skin disorder characterized by well defined, raised patches with a red margin that forms on the skin surface. It usually occurs due to allergy to certain foods or medicines.
Urticaria affecting deeper layers of the skin is referred to as angioedema. Angioedema usually involves the skin around the eyes, cheeks or lips. However, it can also involve the hands, feet, genitals and the mucosa of the throat and bowel in severe cases. Angioedema and urticaria can occur disjointedly or at the same time.
Eczema is a general term used to describe a group of skin diseases in which skin becomes swollen, irritated, and itchy as in a rash. Eczema affects both adults and children, but is most common in babies.
It is a type of atopic dermatitis that develops on direct contact of the skin with the substance. It could be caused either by an irritant or due to an allergic reaction.