Diseases of the Skin, Second Edition discusses dermatology - the diagnosis and treatment procedure on various skin conditions. The author reviews the histology and morphology of the skin. He explains congenital affections of the skin such as ichthyosis, xerodermia, albinism, Mongolian blue spots, and of the hair such as adenoma sebaceum. Some irritation is normal for the skin; certain slight anomalies render the skin vulnerable. Some physical and chemical irritants can excite an otherwise normal skin. These irritations are known as erythema, wheals, blisters, intertrigo (chaffing), erythema ab.