Psoriasis is one of the most commonly and frequently encountered chronic inflammatory dermal diseases, and is characterized by red plaques of various shapes and sizes appearing on the skin, covered with white scales.

Eczema refers to a group of dermal diseases involving rash-like inflammatory skin conditions, and the most common type of eczema is atopic dermatitis or atopic eczema. Atopic diseases have genetically inherited tendency to lead to the development of other allergic conditions, such as asthma and hay fever.