What is the difference between baby heat rash and eczema?

There are several differences between infant heat rash and eczema: 1. Etiology: Heat rash is primarily caused by excessive sweating in hot, humid environments, leading to blocked sweat ducts; eczema, however, may be related to various internal and external factors, including food allergies, genetic factors, and physical irritants. 2. Affected Areas: Heat rash commonly occurs in areas with high sweat production, such as the scalp, forehead, chest, and back; eczema can appear on any part of an infant's body, especially the face, head, trunk, and limbs. 3. Clinical Presentation: Heat rash presents as small, transparent, superficial vesicles or papules the size of a pinhead to a needle head, with surrounding redness; eczema may present with various types of skin rashes, including erythema, papules, and vesicular papules, and may be accompanied by exudation or erosion. 4. Treatment: Heat rash is typically relieved by keeping the skin clean and dry, and by applying calamine lotion; eczema may require treatment targeting the specific underlying cause, such as anti-allergy measures or anti-inflammatory therapy.