Dandruff occurs in 15–20% of the population, and seborrheic dermatitis (with redness and flaking) occurs in 3–5%. The problem affects all races and maybe a bit worse in men. It typically starts after puberty (although babies have a version called cradle cap). Seborrheic dermatitis peaks around the age of 40 and then may improve. Severe seborrheic dermatitis is seen frequently in people with Parkinson’s disease, central nervous system problems, and HIV infection.
Anytime a dry, itchy scalp is interfering with daily activities patients should seek the advice of their trusted clinicians at Smart Skin Dermatology.