What is Dandruff ?
- Dandruff is a common scalp condition in which small pieces of dry skin flake off from the scalp and is usually associated with itching.
- Dandruff typically affects only the scalp and is a mild form with loose adherent flaking.
- Seborrhoeic Dermatitis can extend beyond the scalp and affects the folds besides the nose, ears,
eyebrows, beard area, upper back and chest. Redness and itching of the skin is seen along with flaking which may be dry or yellowish and greasy in nature.
What causes Dandruff and SeborrhoeicDermatitis?
- The exact cause of Dandruff and Seborrhoeic Dermatitis is unknown.
- Possible causes include increased oil production and secretion, increased numbers of normal skin yeasts and a genetic predisposition.
- Common triggers (factors that may worsen) include oily skin or scalp, emotional stress, weather (cold and dry), poor hygiene and infrequent washing or shampooing. Dietary factors do not play a role.
How does Seborrhoeic Dermatitis manifest?
Seborrhoeic Dermatitis commonly manifests in adolescence or adulthood. However it can also be seen in children as cradle cap on the scalp or as a rash in the nappy area.
Seborrhoeic Dermatitis can manifest as itchy flaking skin or the rash may be present without any symptoms. It can have varied presentations as:
- Itchy scalp
- White flakes on shoulders of dark clothing
- Scaly facial skin
- Facial rash over eyebrows, nose, and ears
- Recurrent ear eczema-itchy flaky skin or oozing in the ear canal
- Oily scalp and facial skin with dry flakes
- Rash on the trunk ( mid-chest or mid-back)-dry flakes and red spots
- Rash in the skin folds (armpits, groins, under the breast)-redness/scaling
Which shampoos can be used for Dandruff?
Different types of shampoos may be prescribed for Dandruff. These include:
- Tar-based shampoo
- Ketoconazole based shampoo
- Zinc pyrithione based shampoos
- Selenium sulphide based shampoo
- Ciclopirox based shampoos
Shampoos should be used at least twice a week for 3 to 4 weeks.
Once applied the shampoo needs to be left on for 5 to 7 minutes to ensure adequate time for action.
All affected areas including the scalp, ears, face, and chest should also be washed with the therapeutic shampoo
How can Seborrhoeic Dermatitis be treated?
The treatment options include antidandruff shampoos, cleansers, anti-inflammatory creams/ lotions, antifungals and keratolytics.
The choice of treatment depends on the sites affected, and extent of symptoms. Maintenance treatment is usually needed.
- Mild topical corticosteroids, preferably in lotion form are prescribed for 1-3 weeks to reduce the inflammation. Cream based topical steroids may be used for disease affecting face, ears, eyebrows.
- Topical calcineurin inhibitors such as pimecrolimus cream can be used instead of topical steroids.
- Topical antifungals such as ketoconazole, clotrimazole can be used or combined with mild topical steroids. Oral antifungals are indicated in severe cases.
- Keratolytics can be used to remove scales when necessary, eg salicylic acid, lactic acid, urea, propylene glycol.