Seborrheic dermatitis is a common skin condition that causes red, flaky, and greasy patches, often on the scalp, face, and upper body. It occurs when the skin produces too much oil, leading to irritation and inflammation. This condition can affect people of all ages, but it is particularly prevalent in infants (often referred to as cradle cap) and adults. The exact cause of seborrheic dermatitis is not fully understood, but it is believed to be linked to factors such as yeast overgrowth, hormonal changes, and stress. Treatment options include medicated shampoos, topical creams, and lifestyle changes to help manage symptoms and reduce flare-ups.