Differences Between Eczema and Heat Rash
May 18, 2022
Source: Cainiu Health
Dr. Liu Wan
Introduction
Heat rash is, in fact, a type of eczema. Its onset has multiple causes and is essentially a delayed-type hypersensitivity reaction triggered by various internal and external factors. It is also an inflammatory response characterized by polymorphic skin lesions—some lesions exhibit marked exudation, lichenification (thickening), intense pruritus, and a tendency toward recurrence. Patients often have a family history of atopy or possess an allergic constitution.
Eczema is a very common condition in daily life. Some infants develop numerous skin lesions resembling eczema, yet these symptoms also closely mimic heat rash (miliaria), making it difficult for patients to distinguish between the two. So, what are the differences between eczema and heat rash?
Differences Between Eczema and Heat Rash
Heat rash is, in fact, a type of eczema. Its onset involves multiple contributing factors—both internal and external—and is essentially a delayed-type hypersensitivity reaction, manifesting as an inflammatory response. The associated skin rashes are polymorphic; some exhibit marked exudation, lichenification (skin thickening), intense pruritus (itching), and a tendency toward recurrence. Patients often have a family history of atopy or possess an allergic constitution, and generally display heightened cutaneous sensitivity. Clinically, eczema is commonly classified into three categories: acute, subacute, and chronic.
Causes of Eczema: Many cases diagnosed as “eczema” are actually contact dermatitis, corticosteroid-dependent dermatitis, or atopic dermatitis. However, in some instances, no clear cause can be identified—these are termed “idiopathic” or “unexplained” allergic skin reactions, characterized by recurrent episodes and symptoms such as pruritus and polymorphic rashes. The cornerstone of eczema management is anti-allergic therapy. Triggers may include contact allergens—for example, pollen, paint, or strong odors—or dietary allergens, particularly heterologous proteins found in foods such as fish, shellfish, and other seafood, all of which commonly provoke allergic reactions and subsequent eczema.
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