Which skin condition is most commonly associated with overheating in newborns?

Milia is the most commonly associated skin condition with overheating in newborns. This condition manifests as small, white cysts that typically appear on a newborn's face, particularly around the nose and cheeks. They occur when keratin, a protein in the skin, becomes trapped beneath the surface. Overheating can exacerbate this condition, as it may encourage the blockage of sweat glands and lead to a build-up of heat rash or milia.

Eczema, cradle cap, and psoriasis are different in their presentation and causative factors. Eczema is characterized by itchy, inflamed patches of skin and is often linked to allergens or irritants rather than overheating. Cradle cap (seborrheic dermatitis) primarily affects the scalp and can appear in various severities, but it is thought to result from overactive oil glands rather than direct overheating. Psoriasis is a chronic skin condition that causes thick, red, scaly patches; it is primarily linked to immune system dysfunction and is not typically associated with overheating in newborns. Thus, milia stands out in this context as the skin condition most closely related to overheating.