Which skin condition primarily affects oily areas of the face?

Seborrheic dermatitis is the skin condition that primarily affects oily areas of the face, such as the forehead, nose, and chin, often referred to as the T-zone. This condition is characterized by red, flaky, or greasy patches of skin that can also be accompanied by dandruff in the scalp area. The presence of sebaceous (oil) glands in these regions contributes to the overproduction of sebum, which can lead to the proliferation of a yeast (Malassezia) normally found on the skin, causing inflammation and the associated symptoms.

The other conditions mentioned do not primarily target the oily zones of the face. Actinic keratosis occurs due to prolonged sun exposure and manifests as rough, scaly patches that typically appear on sun-exposed areas, such as the face, ears, and hands. Psoriasis is an autoimmune skin disorder that often appears on the elbows, knees, and scalp, producing silvery scales, and it is not specific to the oily regions. Eczema, or atopic dermatitis, usually presents with dry, itchy patches and can occur anywhere on the body, but it does not primarily target the oily areas of the face like seborrheic dermatitis does.