Final answer:
Scale/seborrhoea is caused by an overproduction of sebum, often leading to seborrheic dermatitis, which results in red, scaly, and sometimes oily patches of skin. Contributing factors can include hormonal changes, yeast on the skin, stress, and environmental factors.
Step-by-step explanation:
The cause of scale/seborrhoea, in the context of skin disorders such as seborrheic dermatitis, is an inflammation of the skin that involves an overproduction and accumulation of sebum, an oily substance secreted by the sebaceous glands. This excess of sebum, mixed with dead skin cells, can cause the skin to form flaky scales and become inflamed, leading to the condition known as seborrheic dermatitis. Factors that contribute to this overproduction include hormonal changes, a yeast that lives on the skin, stress, cold and dry weather, and certain medical conditions and medications.
Seborrheic dermatitis can appear on the scalp as well as other parts of the body with a high concentration of sebaceous glands, such as the face and upper chest. It is known for causing red, scaly, itchy, and sometimes oily skin patches. Good skincare practices and medical treatment can help manage symptoms.