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DERMATOLOGY
Home DERMATOLOGY
Acne keloidalis, or acne keloidalis nuchae (AKN), refers to the keloid-like lesions occurring on the occiput or nape, primarily in young African-American men, with only a few women having the condition.  Development occurs in a window between puberty and 50 years of age.  The term acne keloidalis is a misnomer: • Keloidal collagen is usually not present in this disease. &b ...
Actinic damage, also called sun damage, represents skin changes due to excessive sun exposure.   Ultraviolet light A (UVA) interferes with DNA repair through the release of reactive oxygen, resulting in oxidation of both protein and lipids, whereas ultraviolet light B (UVB) causes DNA mutations. Signs of sun damage include: • Atrophy – thinning of the skin •&nbs ...
Actinic keratosis (AK) becomes more prevalent with advanced age. Over one million new cases are reported annually. This lesion is the principal precursor of squamous-cell carcinoma (SCC) of the skin (6-10%), and 60% of all SCC develop from AK.  Some authors consider it as a type of carcinoma in situ.  AK occurs more frequently in Caucasians with long exposure to ultraviolet radiation (UV ...
The word aphthae is usually used for any painful ulcer of the mucosa, especially the oral mucosa. True aphthae, however, are considered, when one or more areas are ulcerated in the mouth.  They have a recurrent pattern and rapid onset. They are painful, well demarcated, necrotic at first, and not preceded by vesicles or bullae. The best term to define this recurrent entity due to multiple e ...
Atopic dermatitis (AD), sometimes called eczema, is a chronic dermatitis, beginning as early as the first months of life and usually found first on the face and on the extensor sides of the arms and legs are.  It is the most prevalent childhood skin disorder, with more than 10% of children afflicted in developed countries. AD is associated with hay fever and asthma.  Unlike the latter tw ...
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