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Disease Definition
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Alopecia simply means hair loss (baldness). |
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Signs and Symptoms
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Disease Causes, Incidence and Risk Factors
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* Male pattern baldness (androgenic alopecia) is considered normal in adult males. It is easily recognized by the distribution of hair loss over the top and front of the head and by the healthy condition of the scalp. * Alopecia areata is a hair loss condition of unknown cause that can be patchy or extend to complete baldness. * Fungal infections of the scalp usually cause patchy hair loss. The fungus, similar to the ones that cause athlete's foot and ringworm, often glows under ultraviolet light. * Trichotillomania is the name of a mental disorder that causes a person to pull out his/her own hair. * Complete hair loss is a common result of cancer chemotherapy, due to the toxicity of the drugs used. Placing a tourniquet around the skull just above the ears during the intravenous infusion of the drugs may reduce or eliminate hair loss by preventing the drugs from reaching the scalp. * Systemic diseases often affect hair growth either selectively or by altering the skin of the scalp. One example is thyroid disorders. Hyperthyroidism (too much thyroid hormone) causes hair to become thin and fine. Hypothyroidism (too little thyroid hormone) thickens both hair and skin. * Several autoimmune diseases (when protective cells begin to attack self cells within the body) affect the skin, notably lupus erythematosus.
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Disease Diagnosis or Tests
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Dermatologists are skilled in diagnosis by sight alone. For more obscure diseases, they may have to resort to a skin biopsy, removing a tiny bit of skin using a local anesthetic so that it can examined under a micro-scope. Systemic diseases will require a complete evaluation by a physician, including specific tests to identify and characterize the problem. |
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Treatment
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Successful treatment of underlying causes is most likely to restore hair growth, be it the completion of chemotherapy, effective cure of a scalp fungus, or control of a systemic disease. Two relatively new drugs—minoxidil (Rogaine) and finasteride (Proscar)—promote hair growth in a significant minority of patients, especially those with male pattern baldness and alopecia areata. While both drugs have so far proved to be quite safe when used for this purpose, minoxidil is a liquid that is applied to the scalp and finasteride is the first and only approved treatment in a pill form.
Minoxidil was approved for over-the-counter sales in 1996. When used continuously for long periods of time, minoxidil produces satisfactory results in about one quarter of patients with androgenic alopecia and as many as half the patients with alopecia areata. There is also an over-the-counter extra-strength version of minoxidil (5% concentration) approved for use by men only. The treatment often results in new hair that is thinner and lighter in color. It is important to note that new hair stops growing soon after the use of minoxidil is discontinued.
Over the past few decades there have appeared a multitude of hair replacement methods performed by both physicians and non-physicians. They range from simply weaving someone else's hair in with the remains of your own to surgically transplanting thousands of hair follicles one at a time.
Hair transplantation is completed by taking tiny plugs of skin, each containing one to several hairs, from the back side of the scalp. The bald sections are then implanted with the plugs. Research completed in 2000 looked at the new technique of hair grafting, and found that micrografts (one to two hairs transplanted per follicle) resulted in fewer complications and the best results
Another surgical procedure used to treat androgenic alopecia is scalp reduction. By stretching skin the hairless scalp can be removed and the area of bald skin decreased by closing the space with hair-covered scalp. Hair-bearing skin can also be folded over an area of bald skin with a technique called a flap. |
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Prognosis
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The prognosis varies with the cause. It is generally much easier to lose hair than to regrow it. Even when it returns, it is often thin and less attractive than the original. |
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References
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American Society of Health-System Pharmacists Inc. American Hospital Formulary Service Drug Information. Bethesda, MD: American Society of Health-System Pharmacists Inc., 1998.
Bennett, J. Claude, and Fred Plum, ed. Cecil Textbook of Medicine. Philadelphia: W. B. Saunders, 1996.
The Burton Goldberg Group. "Hair loss." In Alternate Medicine: The Definitive Guide. Puyallup, WA: Future Medicine Publishing, 1993.
Isselbacher, Kurt, et al., ed. Harrison's Principles of Internal Medicine. New York: McGraw-Hill, 1994. |
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