Cold dermatitis

Cold dermatitis is a type of dermatitis, but this disease mainly occurs in the summer and generally tends to spread. This will cause many people to have symptoms of dermatitis on their faces, arms, necks and other skin tissues. They will feel extremely itchy, and after scratching with their hands, they will find that their skin is red and swollen. This is a very common situation.

Dermatitis often occurs in the hot summer season and is prone to occur in exposed areas such as the face, neck, arms, back of the hands, etc. It usually appears within a few hours after sun exposure. Initially, the sunburned skin becomes red and swollen. In severe cases, blisters or even large scars may occur. The affected area will experience burning pain or slight itching, which will generally heal after 1-2 days. There will be desquamation or mild pigmentation. In severe cases, there may be general discomfort, fever, nausea, palpitations and other systemic scabies symptoms, which will take about 1 week to recover.

1. When high-efficiency corticosteroids are applied to the same area for more than 3 weeks, secondary symptoms such as erythema, papules, dryness and desquamation, atrophy, stretch marks, telangiectasia, purpura, acne, abnormal pigmentation, rosacea-like dermatitis, perioral dermatitis, photosensitivity, hirsutism, unrecognizable ringworm, and ichthyosis-like changes may occur on the skin.

2. After using the above-mentioned hormone drugs, the primary disease can be rapidly improved; once the drug is stopped, within 1-2 days, the skin at the medication site will develop significant symptoms such as erythema, papules, chapped skin, desquamation, small pustules, itching and tenderness. When the drug is used again, the above symptoms and signs will quickly subside. If it is stopped again, the dermatitis symptoms will quickly recur and gradually worsen. The dependence on hormones is more obvious, especially on the face and vulva.

3. There is obvious itching or burning sensation in the local area.

4. The rash often occurs on the neck, extensor side of the limbs, lower back, fossa, and vulva.

5. The patient feels severe itching and the disease course is chronic, which may recur or persist.

There is often local itching at first. After repeated scratching and rubbing, millet-like, mung bean-sized, round or polygonal flat papules appear locally. They are skin-colored, light red or light brown, and slightly shiny. Later, the number of rashes increases and merges into pieces, becoming typical lichenoid lesions. The lesions vary in size and shape, and there may be a small number of scattered flat papules around them.

In infancy and childhood, the rash is more common on the face and extensor side of the limbs or elbows and popliteal fossa, presenting as polymorphic lesions such as erythema, papules and exudation; in youth and adults, the lesions are lichenification on the flexor or extensor side of the limbs, the rash is extremely itchy, and presents a chronic recurrent process. Determining whether a child has "atopic" diathesis is of great significance for the diagnosis of AD. The main basis is: personal or family history of genetic allergies (asthma, allergic rhinitis, genetic allergic dermatitis), IgE antibody determination and certain pharmacological tests.