The difference between facial eczema and allergies

Facial eczema and allergies, sometimes difficult to distinguish. Because most of the two cases will produce facial obvious erythema, and erythema on the basis of papules, bumps, etc., sometimes both will produce obvious exudation and redness phenomenon. However, the cause of facial eczema may be caused by allergic factors, may also be caused by local adverse stimulation, or may be due to heat exposure, thus leading to local inflammatory reactions, may also be that the patient shows other allergic dermatitis, and other skin diseases lead to an inflammatory reaction of facial skin. Allergy is only skin limited allergy, this cause may be relatively simple, unlike the formation of facial eczema more complex reasons, so the difference between the two may only occur on the source of the difference.