The initial symptoms of seborrheic dermatitis usually manifest as mild erythema or yellowish-brown patches on the skin, commonly found on areas with high sebum secretion such as the scalp, face, chest, and back. These symptoms may not be obvious in the early stages, but as the condition progresses, the rash will gradually enlarge and be accompanied by mild itching.

The initial rash of seborrheic dermatitis may present as oily scaling, especially on the scalp, and patients may notice an increased oiliness between the hair and scalp. This symptom is usually more pronounced in the morning because sebum production is more active at night. On the face, initial symptoms may manifest as mild redness and scaling on the sides of the nose, between the eyebrows, or behind the ears. These symptoms may worsen after meals or prolonged exertion.

While the initial symptoms of seborrheic dermatitis may not be severe, the presence of widespread erythema, intense itching, pain, or pustules may indicate a more serious condition requiring prompt medical attention. It's a common misconception that seborrheic dermatitis is caused by an infection and therefore antibiotics are ineffective. Individual differences are significant, so the presentation of symptoms can vary, making a professional medical diagnosis essential.

[Prevention Tips:]
1. Keep your skin clean and avoid using overly oily skincare products.
2. Wash your hair regularly to avoid scalp oil buildup.
3. Pay attention to a healthy diet and reduce the intake of high-sugar and high-fat foods.
4. Reduce stress and maintain good lifestyle habits.