Is eczema an allergy?

Eczema is a superficial dermal and epidermal inflammation caused by a variety of internal and external factors. The etiology is not clear, and may be related to chronic infection lesions, blood circulation disorders, neuropsychiatric factors, animal fur, various chemicals. It is directly related to personal constitution, it is often difficult to find a clear allergen, can not be simply attributed to allergies. Often manifested as erythema on the basis of small papules, colliculus herpes, severe can show small blisters, often fused into pieces, there is obvious serous exudation. In contrast, contact dermatitis can find a clear allergen, patch test positive, remove the cause of rapid self-healing, no contact without recurrence, this disease is more in line with our normal understanding of allergies.