What is seborrheic dalitis?

Many people usually suffer from dermatitis, skin allergies or eczema, but they have never had scalp inflammation. The scalp does not get inflamed easily, but scalp inflammation caused by disease is very harmful. If many people find that their scalp is very oily and they secrete dandruff for a long time, they will develop seborrheic dandritis over time. Seborrheic dander is a common skin disease that occurs in different groups of people regardless of age. Most of them are due to endocrine disorders, unstable hormones in the body, genetics or bad eating habits. These are the causes of seborrheic danderitis. In normal times, we must distinguish them in time, find the symptoms, and choose the appropriate method to deal with them.

1. What is seborrheic dermatitis?

An inflammatory, scaling disease of the scalp, face, and occasionally other areas of the body. Although the name is seborrhea, the composition and overflow of sebum are usually normal. The disease often occurs in areas where the sebaceous glands are more developed. Inflammation is usually the body's response to the Pityrosporum fungus, which produces oil breakdown.

2. What causes seborrheic dermatitis?

The exact cause of the disease is still unclear, but it is generally believed to be related to endocrine disorders, especially hypersecretion of androgens. In addition, it may also be related to immune status, genetics, hormones, nerves and environmental factors. It is also related to digestive dysfunction, excessive consumption of sweets, excessive fat, mental stress, overwork, bacterial infection, and vitamin B deficiency. Based on excessive sebum secretion, seborrheic dermatitis may be secondary to fungal (Pityrosporum ovale) and bacterial (Propionibacterium acnes) infections, complicated by acne symptoms. It may also cause allergic reactions to fungi and bacteria, and the body's own immune response may also cause the occurrence of eczema-like lesions and disseminated seborrheic dermatitis.

3. In which groups of people can seborrheic dermatitis occur?

Seborrheic dermatitis can occur in any age group, but is most common in adults between the ages of 20 and 50.

4. Where does seborrheic dermatitis occur?

Seborrheic dermatitis often occurs in areas where there are more sebaceous glands, such as the scalp, face, chest and wrinkles. The head and face are the most common. Seborrheic dermatitis can rarely become systemic.

5. What are the symptoms of seborrheic dermatitis on the scalp?

It occurs on the scalp, initially as mildly flushed patches covered with grayish-white bran-like scales, accompanied by mild itching. As the rash expands, greasy, scaly, map-like patches may appear. In severe cases, there is exudation, thick crusts, and a foul odor, and the entire head may be affected. Hair may fall out and become thin.

6. What are the symptoms of seborrheic dermatitis on the face?

Facial lesions are often seen on the nose wings, nasolabial grooves and eyebrow arches, with light red spots covered with greasy yellow scales, and the face is often shiny. Severe patients have yellow-red scaly papules at the hairline, behind the ears, in the external auditory canal, eyebrows, nose, nasolabial folds, and above the sternum. Marginal blepharitis and conjunctival irritation may occur.

7. What are the symptoms of seborrheic dermatitis on the trunk?

On the chest and scapula, there are initially small reddish-brown follicular papules with greasy scales, which gradually develop into larger greasy annular patches with fine scales in the center, dark red papules on the edges. The wrinkles are often seen in the armpits, under the breasts, navel and groin, etc. They are clearly demarcated erythema, with little scaling, moistness, and often accompanied by erosion and exudation.

8. What are the symptoms of seborrheic dermatitis in children?

Seborrheic dermatitis can also occur in newborns, usually between 2 weeks and 6 months after birth, and is manifested by thick yellow crusted lesions on the scalp ("cradle cap"); cracks and yellow scales behind the ears; red papules on the face; and persistent diaper rash. Older children may develop thick, sticky, scaly plaques on the scalp that may reach 1 to 2 cm in diameter.