Pityriasis Rosea
Epidemiology and Etiology Epidemiology Etiology Clinical Presentation Prodrome Cutaneous eruption Primary: Secondary: Diagnosis and Management Diagnosis Pityriasis rosea is a clinical diagnosis. The following tests may be used if the diagnosis is not clear. Management Pityriasis rosea is a self-limiting condition; therefore, usually no treatment is required. Complications Differential Diagnosis References
Bullous Pemphigoid and Pemphigus Vulgaris
Overview Definition Bullous pemphigoid: Pemphigus vulgaris: Epidemiology and etiology Bullous pemphigoid Pemphigus vulgaris Incidence per year 6‒13 per 1 million 0.1‒0.5 per 100,000 Age > 60 years old 40‒60 years old Gender predominance Women = men Women = men Racial/ethnic bias None More common in: Ashkenazi Jewish Southeast Europe Middle East India Etiology None have […]
Cellulitis
Overview Definition Cellulitis is inflammation of the skin and subcutaneous tissues. It is often due to infection. Epidemiology and etiology Risk factors Pathophysiology and Clinical Presentation Pathophysiology Clinical findings Diagnosis Management and Complications Treatment approach Treatment regimen Complications Differential Diagnosis References
Molluscum Contagiosum
Overview Epidemiology Etiology and transmission Pathophysiology Histopathology Clinical Presentation and Diagnosis Clinical presentation of lesions Diagnosis Management Treatment Prognosis Complications Differential Diagnosis References
Angioedema
Overview Definition Angioedema is a localized, self-limited (but potentially life-threatening), nonpitting, asymmetrical edema occurring in the deep layers of the skin and mucosal tissue. May occur with or without urticaria: With urticaria: indicates an IgE-mediated type I hypersensitivity reaction Without urticaria: mediated by substances other than IgE, usually bradykinin Acute or chronic: Acute angioedema: < […]
Necrotizing Fasciitis
Overview Epidemiology Etiology Necrotizing fasciitis is divided into microbiologic categories based on the causative organism(s): Risk factors Pathophysiology Clinical Presentation Skin and soft tissue findings Early signs: Late signs: Common sites of infection: Evidence of systemic toxicity Diagnosis A definitive diagnosis of necrotizing fasciitis is made by surgical exploration and debridement. These processes should not […]
Rosacea
Overview Epidemiology Worldwide incidence: > 5% Age of presentation: 30–50 years old Women > men More common in fair-skinned people Etiology The exact etiology is not understood, but the following may be associated with rosacea: Genetic predisposition Infections: Demodex mites Helicobacter pylori Ultraviolet radiation Vascular hyperactivity causing prolonged flushing: Exercise Hot weather Spicy food Alcohol […]
Melanoma
Overview Definition Melanoma is a malignant tumor arising from melanocytes, the melanin-producing cells of the epidermis. Epidemiology Etiology Anatomy Pathophysiology and Classification Pathogenesis Morphologic types Major types: Types Frequency Growth Morphology Common sites Superficial spreading melanoma 60%–75% Horizontal or radial growth first (highly curable at 1 mm or less) Eventual transition to vertical growth Variable […]
Alopecia
Overview Normal phases of hair growth Anagen: Period of active growth Approximately 90% of all hair follicles are in the anagen phase. Lasts 2–6 years Catagen: Transitory period of follicular degeneration or regression < 1% of all hair follicles are in the catagen phase. Lasts 2–3 weeks Telogen: Period of rest Approximately 10% of all […]
Nevus/Nevi
Definition and Classification Definition A nevus (plural nevi) is a benign neoplasm of the skin: Classification Nevi can be classified in various ways, according to several factors that are not mutually exclusive: Common Congenital Nevi Congenital melanocytic nevus Congenital dermal melanocytosis Nevus of Ito Nevus of Ota Common Acquired Nevi Epidemiology Etiology Histopathology Table: Acquired […]