What are the causes and symptoms of seborrheic dermatitis?

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The cause of seborrheic dermatitis is unclear, though it is has been linked to genetic or environmental factors. Pityrosporum ovale, a species of yeast normally found in hair follicles, has been proposed as one possible causative factor. A high fat diet and alcohol ingestion are thought to play some role. Other possible risk factors include:
- stress and fatigue
- weather extremes (e. g. hot, humid weather or cold, dry weather)
- oily skin
- infrequent shampoos
- obesity
- Parkinson's disease
- AIDS
- use of drying lotions that contain alcohol
- other skin disorders (for example acne, rosacea, or psoriasis)
Mild forms of the disorder may be asymptomatic. Symptoms also disappear and reappear, and vary in intensity over time. When scaling is present, it may be accompanied by itching that can lead to secondary infection.
Source: The Gale Group. Gale Encyclopedia of Medicine, 3rd ed.";
<div class="section1"> The cause of seborrheic dermatitis is unclear, though it is has been linked to genetic or environmental factors. Pityrosporum ovale, a species of yeast normally found in hair follicles, has been proposed as one possible causative factor. A high fat diet and alcohol ingestion are thought to play some role. Other possible risk factors include:<ul> <li>stress and fatigue </li> <li>weather extremes (e. g. hot, humid weather or cold, dry weather)</li> <li>oily skin</li> <li>infrequent shampoos</li> <li>obesity</li> <li>Parkinson's disease</li> <li>AIDS</li> <li>use of drying lotions that contain alcohol</li> <li>other skin disorders (for example acne, rosacea, or psoriasis)</li> </ul> Mild forms of the disorder may be asymptomatic. Symptoms also disappear and reappear, and vary in intensity over time. When scaling is present, it may be accompanied by itching that can lead to secondary infection. </div>Source: The Gale Group. Gale Encyclopedia of Medicine, 3rd ed.";

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