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 Huang Ling Juan
Dermatology
49sec home-news-image

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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Papular urticaria is caused by what?

Papular urticaria is a type of allergic disease, often related to contact with irritants or bites from mosquitoes and fleas. It typically appears as a red wheal on the skin surface, accompanied by severe itching. Scratching can lead to the formation of clear, small blisters at the center or top of the wheal. Once this occurs, it is advisable to expose clothing, bed sheets, and quilt covers to sunlight for disinfection. Avoid keeping pets at home and visiting areas with abundant flowers and trees. Conventional antiallergic medications generally can cure papular urticaria in a short period. If blisters appear, try not to scratch them open to prevent bacterial infections.

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Written by Du Kun
Dermatology
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Does blistering in papular urticaria mean it is getting better?

Papular urticaria blistering is not a sign of quick recovery, but rather a peak in the condition. Papular urticaria, as we discuss it, primarily refers to a skin allergic inflammatory reaction caused by insect bites. The areas with more severe inflammation, which are typically at the very center of the rash, may develop blisters. The occurrence of blistering marks a peak period in the course of the disease, not a sign of improvement. As the blisters dry up and crust over, the rash begins to resolve, and the intensity of itching also decreases. The blistering in papular urticaria does not indicate that the disease is quickly subsiding; rather, it is a manifestation of a peak in the disease. After the blisters have dried up, itching gradually lessens, which is the actual sign that the condition is about to improve.

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Written by Qu Jing
Dermatology
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The cause of papular urticaria

Papular urticaria, also known as insect bite dermatitis, is commonly seen in children and individuals with lower resistance and sensitive skin. It is caused by bites from insects such as mosquitoes and mites. The resulting skin reaction varies from person to person and is characterized by red patches and blisters. According to Traditional Chinese Medicine, it can be categorized into damp-heat type and wind-heat type. The wind-heat type usually occurs on the limbs, while the damp-heat type is more common around the waist and features larger and more numerous blisters. This condition is related to insect bites, commonly from mosquitoes, lice, fleas, mites, bedbugs, etc. After being bitten, the saliva injected into the skin may trigger an allergic reaction in the body.

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Written by Liu Jing
Dermatology
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Can urticaria papulosa be washed with hot water during bathing?

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.)