Dandruff: A scalp condition that produces white flakes that may be shed and fall from the hair. One cause of dandruff is overworking of the sebaceous glands. Another cause of dandruff is fungus, especially an abundance of the fungus Pitrosporum ovale. If several weeks of using a good-quality shampoo does not stop the dandruff, treatment options include an antifungal shampoo such as Denorex, DHS Targel, ionil-T plus, MG217, Neutrogena T/Gel, Scalpicin, Sebulex, Selsun Blue, Tegrin, or Zircon. The active ingredients approved for dandruff treatment by the US Food and Drug Administration (FDA) include tar, pyrithione zinc, salicylic acid, selenium sulfide, sulfur, and ketoconazole.
- Dandy fever
Dandy fever: An acute mosquito- borne viral illness of sudden onset that usually follows a benign course with headache, fever, prostration, severe joint and muscle pain, swollen glands (lymphadenopathy) and rash. The presence (the “dengue triad”) of fever, rash, and headache (and other pains) is particularly characteristic. Better known as dengue, the disease is endemic […]
- Danlos syndrome
Danlos syndrome: Better known as Ehlers-Danlos syndrome (EDS), is an inherited disorder with easy bruising, joint hypermobility (loose joints), skin laxity, and weakness of tissues. There are a number of different Ehlers-Danlos syndromes which share these features but can be categorized into nine different types. Type I EDS (the “gravis” form od EDS) is characterized […]
- Danon disease
Danon disease: A genetic disorder characterized by heart problems, mental retardation and muscle weakness. Changes in the retina of the eye, leading to visual disturbances, may be present. Males are more severely affected and show symptoms in childhood or early adolescence, while affected females usually develop the symptoms later, in adolescence or adulthood. The disease […]
- Darier disease
Darier disease: A genetic skin disease characterized by an abnormality of the horny layer of the skin around the hair follicles. This disorder is inherited in an autosomal dominant manner and is due to mutation in a gene called ATP2A2 on chromosome 12. Also known as keratosis follicularis.
- Dark adaptometry
Dark adaptometry: A type of electrophysiologic retinal testing done to diagnose and manage retinal degeneration by measuring the length of time it takes for the retina to regain maximal sensitivity to low amounts of light after it has been exposed to bright light then returned to darkness.