A microscopic image of human dandruff
|Classification and external resources|
Dandruff is the shedding of dead skin cells from the scalp. As skin cells die, a small amount of flaking is normal; about 487,000 cells/cm2 get released normally after detergent treatment. Some people, however, experience an unusually large amount of flaking either chronically or as a result of certain triggers, up to 800,000 cells/cm2, which can also be accompanied by redness and irritation.
Dandruff is a common scalp disorder affecting almost half of the population at the post-pubertal age and of any sex and ethnicity. It often causes itching. It has been well established that keratinocytes play a key role in the expression and generation of immunological reactions during dandruff formation. The severity of dandruff may fluctuate with season as it often worsens in winter. Dandruff is rare before puberty, peaks in the teens and early twenties, and declines with age thereafter. Most cases of dandruff can be easily treated with specialized shampoos. There is, however, no true cure.
Those affected by dandruff find that it can cause social or self-esteem problems, indicating treatment for both psychological and physiological reasons.
Signs and symptoms
Dandruff can have several causes, including dry skin, seborrhoeic dermatitis, not cleaning/scrubbing often enough, shampooing too often, psoriasis, eczema, sensitivity to hair care products, or a yeast-like fungus. Dry skin is the most common cause of flaking dandruff.
As the epidermal layer continually replaces itself, cells are pushed outward where they eventually die and flake off. For most individuals, these flakes of skin are too small to be visible. However, certain conditions cause cell turnover to be unusually rapid, especially in the scalp. It is hypothesized that for people with dandruff, skin cells may mature and be shed in 2–7 days, as opposed to around a month in people without dandruff. The result is that dead skin cells are shed in large, oily clumps, which appear as white or grayish patches on the scalp, skin and clothes.
According to one study, dandruff has been shown to possibly be the result of three factors:
- Skin oil commonly referred to as sebum or sebaceous secretions
- The metabolic by-products of skin micro-organisms (most specifically Malassezia yeasts)
- Individual susceptibility and allergy sensitivity.
According to 2016 study bacteria (mainly Propionibacterium and Staphylococcus) are more important to dandruff formation than fungi. Bacteria presence was in turn influenced by water and sebum amount.
Older literature cites the fungus Malassezia furfur (previously known as Pityrosporum ovale) as the cause of dandruff. While this species does occur naturally on the skin surface of both healthy people and those with dandruff, in 2007 it was discovered that the responsible agent is a scalp specific fungus, Malassezia globosa, that metabolizes triglycerides present in sebum by the expression of lipase, resulting in a lipid byproduct oleic acid (OA). During dandruff, the levels of Malassezia increase by 1.5 to 2 times its normal level. Penetration by OA of the top layer of the epidermis, the stratum corneum, results in an inflammatory response in susceptible persons which disturbs homeostasis and results in erratic cleavage of stratum corneum cells.
In seborrhoeic dermatitis redness and itching frequently occur around the folds of the nose and eyebrow areas, not just the scalp. Dry, thick, well-defined lesions consisting of large, silvery scales may be traced to the less common affliction of the scalp psoriasis.
Inflammation and extension of scaling outside the scalp exclude the diagnosis of dandruff from seborrhoeic dermatitis. However, many reports suggest a clear link between the two clinical entities - the mildest form of the clinical presentation of seborrhoeic dermatitis as dandruff, where the inflammation is minimal and remain subclinical.
Seasonal changes, stress, and immuno-suppression seem to affect seborrheic dermatitis.
Dandruff scale is a cluster of corneocytes, which have retained a large degree of cohesion with one another and detach as such from the surface of the stratum corneum. A corneocyte is a protein complex that is made of tiny threads of keratin in an organised matrix. The size and abundance of scales are heterogeneous from one site to another and over time. Parakeratotic cells often make up part of dandruff. Their numbers are related to the severity of the clinical manifestations, which may also be influenced by seborrhea.
Shampoos use a combination of special ingredients to control dandruff.
Ketoconazole is a broad spectrum, antimycotic agent that is active against both Candida and M. furfur. Of all the imidazoles, ketoconazole has become the leading contender among treatment options because of its effectiveness in treating seborrheic dermatitis as well.
Dandruff affects up to half of adults.
- Rapini, Ronald P.; Bolognia, Jean L.; Jorizzo, Joseph L. (2007). Dermatology: 2-Volume Set. St. Louis: Mosby. ISBN 1-4160-2999-0.
- Ranganathan S, Mukhopadhyay T; Mukhopadhyay (2010). "DANDRUFF: THE MOST COMMERCIALLY EXPLOITED SKIN DISEASE". Indian J Dermatol. 55 (2): 130–134. PMC . PMID 20606879. doi:10.4103/0019-5154.62734.
- "Mayo Clinic, Dandruff". Mayo Clinic, Dandruff. Mayo clinic. Retrieved 8 January 2016.
- Turkington, Carol; Dover, Jeffrey S. (2007). The Encyclopedia of Skin and Skin Disorders, Third Edition. Facts On File, Inc. p. 100. ISBN 0-8160-6403-2.
- "A Practical Guide to Scalp Disorders". Journal of Investigative Dermatology Symposium Proceedings. December 2007. Retrieved 2009-02-06.
- Turner, GA; Hoptroff, M; Harding, CR (Aug 2012). "Stratum corneum dysfunction in dandruff.". International journal of cosmetic science. 34 (4): 298–306. PMC . PMID 22515370. doi:10.1111/j.1468-2494.2012.00723.x.
- "What Is Dandruff? Learn All About Dandruff". Medical News Today.
- DeAngelis YM, Gemmer CM, Kaczvinsky J.R, Kenneally DC, Schwartz JR, Dawson TL; Gemmer; Kaczvinsky; Kenneally; Schwartz; Dawson Jr (2005). "Three etiologic facets of dandruff and seborrheic dermatitis: Malassezia fungi, sebaceous lipids, and individual sensitivity". J. Investig. Dermatol. Symp. Proc. 10 (3): 295–7. PMID 16382685. doi:10.1111/j.1087-0024.2005.10119.x.
- Ro BI, Dawson TL; Dawson (2005). "The role of sebaceous gland activity and scalp microfloral metabolism in the etiology of seborrheic dermatitis and dandruff". J. Investig. Dermatol. Symp. Proc. 10 (3): 194–7. PMID 16382662. doi:10.1111/j.1087-0024.2005.10104.x.
- Ashbee HR, Evans EG; Evans (2002). "Immunology of Diseases Associated with Malassezia Species". Clin. Microbiol. Rev. 15 (1): 21–57. PMC . PMID 11781265. doi:10.1128/CMR.15.1.21-57.2002.
- Batra R, Boekhout T, Guého E, Cabañes FJ, Dawson TL, Gupta AK; Boekhout; Guého; Cabañes; Dawson Jr; Gupta (2005). "Malassezia Baillon, emerging clinical yeasts". FEMS Yeast Res. 5 (12): 1101–13. PMID 16084129. doi:10.1016/j.femsyr.2005.05.006.
- Dawson TL (2006). "Malassezia and seborrheic dermatitis: etiology and treatment". Journal of cosmetic science. 57 (2): 181–2. PMID 16758556.
- Gemmer CM, DeAngelis YM, Theelen B, Boekhout T, Dawson Jr TL; Deangelis; Theelen; Boekhout; Dawson Jr Jr (2002). "Fast, Noninvasive Method for Molecular Detection and Differentiation of Malassezia Yeast Species on Human Skin and Application of the Method to Dandruff Microbiology". J. Clin. Microbiol. 40 (9): 3350–7. PMC . PMID 12202578. doi:10.1128/JCM.40.9.3350-3357.2002.
- Gupta AK, Batra R, Bluhm R, Boekhout T, Dawson TL; Batra; Bluhm; Boekhout; Dawson Jr (2004). "Skin diseases associated with Malassezia species". J. Am. Acad. Dermatol. 51 (5): 785–98. PMID 15523360. doi:10.1016/j.jaad.2003.12.034.
- "Genetic code of dandruff cracked". BBC News. 2007-11-06. Retrieved 2010-04-30.
- Pierard-Franchimont C, Hermanns JF, Degreef H, Pierard GE; Xhauflaire-Uhoda; Piérard (2006). "Revisiting dandruff". Int J Cosmet Sci. 28 (5): 311–318. PMID 18489295. doi:10.1111/j.1467-2494.2006.00326.x.
- Pierard-Franchimont C, Hermanns JF, Degreef H, Pierard GE. From axioms to new insights into dandruff. Dermatology 2000;200:93-8.
- Milani, M; Antonio Di Molfetta, S; Gramazio, R; Fiorella, C; Frisario, C; Fuzio, E; Marzocca, V; Zurilli, M; Di Turi, G; Felice, G (2003). "Efficacy of betamethasone valerate 0.1% thermophobic foam in seborrhoeic dermatitis of the scalp: An open-label, multicentre, prospective trial on 180 patients". Current Medical Research and Opinion. 19 (4): 342–5. PMID 12841928. doi:10.1185/030079903125001875.
- WebMD: Anti-Dandruff (coal tar)
- H. Panda (2004). Handbook On Ayurvedic Medicines With Formulae, Processes And Their Uses. ISBN 9788186623633.
- Zhong Ying Zhou; Hui De Jin (1997). Clinical manual of Chinese herbal medicine and acupuncture. ISBN 9780443051289.
- "Tea tree oil". Medline Plus, a service of the U.S. National Library of Medicine from the National Institutes of Health. 27 July 2012.
- Prensner R (2003). "Does 5% tea tree oil shampoo reduce dandruff?". The Journal of family practice. 52 (4): 285–6. PMID 12681088.
- "dandruff | dandriff, n." OED Online. Oxford University Press, March 2015. Web. Retrieved 27 April 2015.