How to correctly distinguish dermatitis from urticaria

Urticaria has a very obvious feature, that is, urticaria rash, which can be found at first sight in most cases. But these are not static, and it is often difficult to distinguish symptoms from other skin diseases, which leads to obstacles in diagnosis. Therefore, in clinical diagnosis, careful observation and careful identification should be made to avoid delaying treatment.

1, the difference between pruritus and urticaria is common, and it will be misdiagnosed as urticaria, because the affected area will produce some marks that are particularly similar to scratching; Urticaria is easy to distinguish. Although there is itching, patients don't like itching after scratching, leaving obvious marks, which may not be so rough skin itching and desquamation.

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Or long and small nodules.

2. The difference from erythema multiforme, erythema annularis and chronic vaginal erythema: wheal sometimes looks like erythema multiforme and erythema annularis because of the change of appearance, but the easiest place to distinguish between them is that urticaria comes and goes quickly, and these erythema will last for a long time and it is difficult to disappear in the human body.

3. Allergic contact dermatitis of eyelid

The difference from vascular edema: eyelid edema, unable to open, the same symptoms, making it difficult to distinguish the two diseases. However, it can be divided into allergic contact dermatitis, most of which have a recent history of chemical contact, accompanied by exudation, blisters and peeling, which lasts much longer than urticaria.

4. Different from hereditary allergic dermatitis, when hereditary allergic dermatitis occurs, the affected skin is flushed and itchy, and patients often have local swelling and scratches after scratching, which is easy to cause infant dermatitis, and children often have acute urticaria, which is difficult to diagnose.