Which type of dermatitis is commonly known as "cradle cap" in infants?

Seborrheic dermatitis is indeed the condition commonly referred to as "cradle cap" in infants. This type of dermatitis is characterized by greasy, scaly patches that typically appear on an infant's scalp, though it can also affect the face and other areas. The exact cause of seborrheic dermatitis is not entirely understood, but it is believed to be associated with overactive sebaceous (oil) glands and a fungal organism called Malassezia that thrives in oily environments.

In infants, seborrheic dermatitis usually resolves on its own as they grow and their sebaceous gland activity normalizes. The appearance of cradle cap is benign, and while it may look concerning to parents, it is not harmful and does not cause discomfort to the child. Treatment may involve gentle cleansing of the scalp and the use of medicated shampoos if the condition persists.

The other types of dermatitis listed have different characteristics and causes. For instance, atopic dermatitis is a chronic condition often associated with allergies and is characterized by intense itching and inflamed skin, while contact dermatitis is a reaction resulting from skin contact with irritants or allergens. Psoriasis is a chronic autoimmune condition that can affect various parts of the body, resulting in thickened, red patches of