Final answer:
Seborrheic dermatitis is a common skin condition that causes red, itchy, and flaky patches of skin. Middle-aged individuals may also experience associated conditions like contact dermatitis, tuberculin reaction, and autoimmune diseases such as diabetes mellitus type I, multiple sclerosis, and rheumatoid arthritis.
Step-by-step explanation:
Seborrheic dermatitis is a common skin condition characterized by red, itchy, and flaky patches of skin. It commonly affects the scalp, face, and other oily areas of the body. Middle-aged individuals are more prone to developing this condition due to hormonal changes and a weakened immune system.
In addition to seborrheic dermatitis, middle-aged individuals may also experience other associated conditions such as contact dermatitis, which is caused by exposure to certain substances like latex. Tuberculin reaction is another condition that can occur in response to exposure to tuberculosis antigens. Autoimmune diseases like diabetes mellitus type I, multiple sclerosis, and rheumatoid arthritis have also been associated with seborrheic dermatitis.