How is seborrheic dermatitis primarily identified?

Seborrheic dermatitis is primarily identified by excessive oiliness and redness, which are hallmark characteristics of this skin condition. This disorder typically manifests in areas of the skin where sebaceous (oil) glands are more active, such as the scalp, face, and upper back. The increased oil production, combined with inflammation, leads to the characteristic redness observed in affected areas.

In addition to oiliness and redness, seborrheic dermatitis can also produce yellowish, greasy scales, which contributes to its diagnosis. This presentation differentiates it from other skin conditions, which may have overlapping symptoms but do not typically present with the same degree of oiliness or the specific distribution of redness commonly seen in seborrheic dermatitis.