Can urticaria papulosa be washed with hot water during bathing?

Written by Liu Jing
Dermatology
Updated on May 22, 2025
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The so-called papular urticaria is an allergic reaction associated with insect bites. It is advised not to wash the affected area with hot water; instead, bathing with lukewarm water is acceptable. Key preventive measures include managing the environment to avoid further insect bites and administering anti-allergy and anti-itch treatments. Oral medications such as loratadine syrup, prednisone acetate tablets, and vitamin C tablets are recommended. At the site of the skin lesions, topical medications such as fluticasone propionate, triamcinolone acetonide econazole cream, desonide cream, or antipruritic moisturizing cream can be used. If secondary symptoms such as ulceration and blister formation occur, it is necessary to enhance the cleanliness of the rash to prevent secondary bacterial infections by applying saline solution, Kangfuxin solution, or Phellodendron solution on the eroded areas. (Medication should be used under the guidance of a physician.)

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Written by Liu Gang
Dermatology
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Papular urticaria causes and symptoms

Papular urticaria is a type of allergic reaction, which is specifically related to exposure to irritants, or bites from mosquitoes and fleas. The cause of this disease is relatively clear. Generally, the main symptom is the appearance of red wheals on the body with clear boundaries. At the center of the wheal, there may be a puncture point or small blisters. The primary symptom is itchiness, which is often severe. Repeated scratching of the small blisters can lead to rupture and infection. Therefore, it is important to treat this disease as soon as it is discovered, using oral and topical anti-allergy medications, which generally subside within about a week. It is also advisable to avoid keeping small animals at home and to frequently disinfect bedding by exposing it to sunlight. (Medicine should be used under the guidance of a doctor, based on specific circumstances.)

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Written by Liu Gang
Dermatology
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Can urticaria papulosa heal by itself?

Papular urticaria is a type of allergic disease, generally with mild symptoms. It manifests as red wheals with small blisters on top. Most cases do not require treatment and will subside gradually over time. It is advisable not to scratch these small blisters as breaking them can lead to infection. It is recommended to frequently expose clothes, bed sheets, and quilt covers to the sun for disinfection to eliminate mites or insects. Avoid contact with small animals and places with abundant flowers, plants, and trees. Also, avoid spicy and irritating foods and do not stay up late. Typically, conventional medications can completely cure the condition within about a week. Paying attention to diet and lifestyle habits is generally sufficient.

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Written by Huang Ling Juan
Dermatology
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How long does it take for papular urticaria to be considered chronic?

Papular urticaria is usually referred to as insect bite dermatitis, with the course of the condition generally lasting about a week; if it extends beyond a week, it is considered chronic. The occurrence of papular urticaria is associated with bites from mosquitoes, mites, fleas, etc. In terms of treatment, topical applications such as calamine lotion or corticosteroid creams can be used, including mometasone furoate gel and hydrocortisone butyrate cream. For significant itching, oral antihistamines can also be taken, such as fexofenadine hydrochloride tablets or cetirizine hydrochloride oral solution, while avoiding washing with hot water.

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Written by Liu Gang
Dermatology
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Can people with papular urticaria eat fish?

Papular urticaria is a type of allergic reaction, related to direct contact with irritants or bites from mosquitoes and fleas. During treatment for this condition, it is generally advised to avoid eating spicy foods, fish, and shrimp, as these can aggravate allergic diseases by inducing inflammation or worsening itching. Severe scratching may also lead to the formation of small blisters, which, if burst, could potentially cause bacterial infection. Therefore, this disease must be treated formally. It is advisable to avoid spicy and irritating foods, refrain from staying up late, and avoid places with a high presence of mosquitoes and fleas. Pets should not be kept in the home; if pets are present, it is crucial to maintain their hygiene and regularly disinfect and expose bedding and covers to sunlight.

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Written by Liu Gang
Dermatology
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Can papular urticaria heal by itself?

Papular urticaria is a type of allergic reaction, with most allergens being relatively clear. It is related to contact with irritants or bites from mosquitoes and fleas. Generally, if the symptoms of the disease are mild, no treatment is needed, and it can go away on its own after a few days. However, if the symptoms are severe, such as the appearance of blisters or signs of infection, it is best to treat symptomatically. Commonly used oral and topical anti-allergy medications can be employed. It is also important to frequently expose clothes, bed sheets, and duvet covers to sunlight for disinfection to eliminate mites or fleas. Do not keep small animals at home, try to avoid going to places with many flowers and trees, refrain from consuming spicy and irritating foods, and avoid staying up late.