Seborrheic dermatitis
Seborrheic dermatitis, or seborrheic eczema, is characterized by red patches and whitish scales. These are most often located on the face or on the scalp, and more specifically on areas rich in sebum. The skin can then itch strongly and scratching can cause lesions that aggravate the situation.
If its origin is multifactorial, sebum and Malassezia yeasts play a role in its development.