What condition is characterized by erythematous scaly plaques on the scalp and face in a 6-month-old male?

Seborrheic dermatitis is the correct condition characterized by erythematous scaly plaques on the scalp and face in an infant. In infants, this condition often presents as "cradle cap" when it affects the scalp, although it can also involve the face, particularly around the eyebrows, eyelids, and behind the ears.

The appearance of oily, yellowish scales accompanied by crusting and inflammation distinguishes seborrheic dermatitis from other skin conditions. It is believed to be linked to the overgrowth of Malassezia yeast and can be exacerbated by sebum production, especially in young infants whose sebaceous glands are still maturing.

Atopic dermatitis, while also common in infants and presenting with red, itchy patches, typically manifests with a different distribution on the body, often sparing the diaper area and featuring more acute excoriation compared to the mild scaling of seborrheic dermatitis.

Psoriasis, although it can also present with scaly plaques, is less common in infants and has a distinct appearance with well-defined borders and potential for association with nail pitting or psoriatic arthritis later in life.

Contact dermatitis usually results from an external irritant or allergen leading to localized contact reactions, and its presentation