Table 1.

Different Types of Skin Reactions

Type	Irritated Skin	Allergic Skin	Sensitive Skin	Atopic Skin
Pathophysiology	Chemical reaction	Allergy	Neuropathic disorder	Atopy
Triggering factors	Irritant chemicals	Allergens	Physicochemical factors	Atopens, stress
Affected individuals	All	Allergic	Reactive	Atopic
Area	Area of application	Area of application and beyond	Area of application and beyond	Widespread
Objective symptoms	Erythema	Erythema, vesicles	Erythema	Erythema, vesicles
Subjective symptoms	Pain	Pruritus	Paresthesia	Pruritus
Epicutaneous tests	Irritative type	Eczema	Negative	Eczema
In vitro tests	Specific to irritants	Specific to allergens	Capsaicin, lactic acid	None