Condition	Characteristics
Contact dermatitis	Occurs in all age groups; distribution is related to exposure; primarily appears as erythema, but vesicles or bullae may occur; pruritic; widespread crusting is uncommon
Eczema herpeticum	Most common in children two to three years of age; begins on head or neck; dome-shaped vesicles that umbilicate, rupture, and often coalesce; caused by herpes simplex virus 1 infection
Eczema vaccinatum	Occurs on areas affected by atopic dermatitis after exposure to smallpox vaccine; umbilicated papules and vesicles usually in a uniform stage of development
Impetigo	Common in children; can occur anywhere on the body; may begin as a vesicle or pustule, but is rarely widespread; honey-colored crusting
Varicella	Begins on trunk then spreads to face and extremities; vesicle on a pink papule; multiple stages present simultaneously