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Profile: Seborrheic Dermatitis

Definition: Seborrheic dermatitis is a common inflammatory skin condition, often referred to as "immuno-allergic," characterized by the presence of erythematous patches (redness) topped with greasy, yellowish scales. These lesions typically affect skin areas where sebum secretion is high (scalp, sides of the nose, eyebrows, beard, etc.). It is a benign, non-contagious but chronic disease, meaning it progresses in flare-remission cycles. It affects more men than women, with a peak frequency between the ages of 18 and 40. The pathophysiology of seborrheic dermatitis is still not entirely clear, but its development has been associated with an abnormal proliferation of a lipophilic yeast (unicellular fungus) of the Malassezia genus, which then triggers an abnormal immune response in the host.
Internal and external causes: Genetic predisposition to this dermatosis likely involves an immune dysfunction; diseases (HIV infection, Parkinson's disease, Down syndrome);
How to reduce or eliminate: Consulting a dermatologist; topical treatment with antifungals (ketoconazole, miconazole, ciclopirox olamine), lithium salts, keratolytics, calcineurin inhibitors (tacrolimus, pimecrolimus); narrowband UVB phototherapy; oral intake of isotretinoin.
Preventative steps to take: Use gentle cleansing care; cleanse daily to remove excess sebum; keep your skin hydrated with non-greasy creams or lotions; protect yourself from UV rays with a non-greasy sunscreen; avoid vigorous towel rubbing and instead opt for pat drying; refrain from scratching lesions in case of itching.

Related articles: Dermite séborrhéique.