Is allergic dermatitis contagious?

Written by Zhu Zhu

Dermatology

Updated on April 27, 2025

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Allergic dermatitis is a common skin disease, which is an inflammatory skin disease caused by contact with allergens. So, is allergic dermatitis contagious? It is not contagious. This disease can cause itchy skin, formation of vesicles or papules, redness, or swelling. Once symptoms appear, it is recommended to treat with anti-allergic medication. Also, it is important to avoid contact with allergens again, eat a light diet, and ensure adequate rest.

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Written by Li Jiao Yan

Neonatology

1min 21sec

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How to treat diaper rash dermatitis?

Diaper dermatitis is primarily a type of contact dermatitis that occurs because the diapers soaked with urine and feces are not changed in time. Decomposition materials in urine and feces irritate the skin, causing inflammation. The main treatment involves keeping the buttocks dry and changing diapers frequently. It is necessary to wash the buttocks, genital area, and surrounding skin with clean water daily, and to rinse the anus and surrounding skin with water after bowel movements. Diapers should be thoroughly rinsed with clean water and not wrapped with plastic on the outside. If using disposable diapers, choose ones that are soft, not rough, and breathable. If there is a bacterial or fungal infection, topical antibiotics or antifungal medications should be used. For mild cases with only redness, consider keeping the buttocks dry. In cases where there is significant erosion, some medications may be used for intervention. If there is skin redness, topical calamine lotion can be applied. If the diaper dermatitis is severe and the baby is fussy and uncomfortable, it is advised to visit a hospital for a doctor to provide treatment based on the specific condition of the baby.

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Written by Xie Ming Feng

Dermatology

1min 20sec

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The difference between neurodermatitis and allergic dermatitis

Neurodermatitis, also known as chronic simple lichen, is a common chronic inflammatory skin disease characterized by paroxysmal severe itching and lichenoid skin changes. Its main causes may be related to various internal and external factors such as neuropsychiatric factors, gastrointestinal dysfunction, endocrine disorders, diet, and local skin irritation. It commonly occurs on the neck, elbows, lumbosacral area, inner thighs, perineum, and around the anus. The skin lesions are characterized by pinpoint or rice grain-sized polygonal flat papules that are pale red, tan, or normal skin color, with a hard and glossy texture. They may be covered with a small amount of scale and, over time, can merge into large plaques, leading to thickened, rough skin with lichenoid changes. Allergic dermatitis is an hypersensitivity reaction skin disease caused by contact with various allergens, characterized by diverse skin lesions such as erythema, papules, vesicles, swelling, and itching, which can occur all over the body. However, localized allergic dermatitis, if treated improperly or not treated in a timely manner, or due to repeated scratching, can potentially develop into neurodermatitis.

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Written by Huang Ling Juan

Dermatology

1min 4sec

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What is eczematous dermatitis?

Eczematous dermatitis is a manifestation of dermatitis, with the main clinical manifestations being millet-sized papules, vesicopustules, or vesicles on the skin, accompanied by erythema that can merge into patchy areas. Frequent scratching can lead to exudation, erosion, secondary infection, and in severe cases, the formation of pustules and crusts. Eczematous dermatitis is a type of allergic skin disease. It is usually necessary to identify the specific allergens involved. One can visit a hospital to check for allergens and then undergo treatment with antihistamines as directed by a doctor. If there is significant exudation, topical treatment can include wet dressings with lactic acid, ichthammol solution, or boric acid solution. Treatment can also be supplemented with traditional Chinese medicine and Western medicine combined, based on differential diagnosis.

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Written by Zhu Zhu

Dermatology

42sec

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What can be eaten with allergic dermatitis?

Allergic dermatitis is an inflammatory skin disease related to allergies. Therefore, patients with allergic dermatitis definitely need to pay attention to their diet: First, it is recommended to eat more foods rich in vitamins and protein, such as apples, pears, and lean meat. Moreover, it is advised not to drink alcohol or alcoholic beverages, as alcohol can stimulate the worsening of allergic symptoms and increase dermatitis reactions. Lastly, eating more fresh vegetables and fruits is beneficial.

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Written by Zhu Zhu

Dermatology

35sec

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Is allergic dermatitis contagious?

Allergic dermatitis is a common skin disease, which is an inflammatory skin disease caused by contact with allergens. So, is allergic dermatitis contagious? It is not contagious. This disease can cause itchy skin, formation of vesicles or papules, redness, or swelling. Once symptoms appear, it is recommended to treat with anti-allergic medication. Also, it is important to avoid contact with allergens again, eat a light diet, and ensure adequate rest.