Prickly heat is a physical skin condition that often occurs in hot and humid summer weather, related to excessive sweating, especially common among infants, the elderly, and people working in high-temperature environments. It appears in three types: white, pustular, and red prickly heat. Generally, prickly heat does not have systemic symptoms; it does not feature fever and is not contagious. Chickenpox, on the other hand, is a common acute infectious skin disease, mainly characterized by scattered erythema and vesicles on the trunk, face, and proximal limbs. It is contagious and has prodromal symptoms such as fever, fatigue, and muscle soreness.