The Skin in Immune, Autoimmune, and Rheumatic Disorders Systemic Amyloidosis ICD-9: 277.3 ICD-10: E85.3 Amyloidosis is an extracellular deposition in various tissues of amyloid fibril proteins and of a protein…

Bacterial Colonizations and Infections of Skin and Soft Tissues The human microbiome or microbiota represents diverse viral, bacterial, fungal, and other species that live on and within us. They are…

Benign Neoplasms and Hyperplasias Disorders of Melanocytes Acquired Nevomelanocytic Nevi (NMN) NMN, commonly called moles, are very common, small (<1 cm), circumscribed, acquired pigmented macules, papules, or nodules. Composed of…

Viral Diseases of Skin and Mucosa Introduction Viral infections of skin and mucosa produce a wide spectrum of local and systemic manifestations. Human papillomavirus (HPV) and molluscum contagiosum virus (MCV)…

Endocrine, Metabolic and Nutritional Diseases Skin Diseases in Pregnancy Normal skin changes associated with pregnancy are darkening of linea alba (linea nigra), melasma (see Section 13), and striae distensae (Fig….

Disorders of the Nail Apparatus Normal Nail Apparatus The nail apparatus is made up of: Nail plate, the horny “dead” product. Four specialized epithelia: proximal nail fold, nail matrix, nail…

Disorders of the Genitalia, Perineum, and Anus Anogenital skin and mucosa are subject to unique disorders because of their special anatomy. Dermatologic and systemic disorders occur in the anogenital region….

Disorders of the Mouth Oral mucosa covers and protects tissues beneath it and conveys sensory information from the surface. Normal function is required for mastication, deglutition, chemosensory function, and phonation….

Photosensitivity, Photo-Induced Disorders, and Disorders by Ionizing Radiation Skin Reactions to Sunlight ICD-9: 692.70 ICD-10: L56.8 The term photosensitivity describes an abnormal response to sunlight. Cutaneous photosensitivity reactions require absorption…