What causes erythema in newborns?
Jan 11, 2022
Source: Cainiu Health
Dr. Liu Wan
Introduction
A newborn’s skin is delicate, with abundant subcutaneous blood vessels. The stratum corneum—the outermost layer of the epidermis—is not yet fully developed, and the dermis is relatively thin, containing sparse fibrous tissue. However, the capillary network is well-developed. Upon delivery from the mother’s uterus—where the fetus was immersed in amniotic fluid—the newborn transitions abruptly to a dry external environment. Even mild stimuli, such as clothing or medications, can readily cause cutaneous hyperemia (skin redness) in the infant.
Many adults are first-time parents and, as such, are deeply concerned about their newborn’s health. Some parents may notice red patches on their baby’s skin shortly after birth. In such cases, it is important to consider whether these erythematous lesions stem from an underlying medical condition. Diagnosis therefore requires careful evaluation of the infant’s specific clinical manifestations. Indeed, numerous factors must be considered when assessing neonatal skin erythema. So—what causes red patches in newborns?
What Causes Red Patches in Newborns?
Physiological Causes
Newborn skin is exceptionally delicate, with abundant subcutaneous blood vessels. The epidermal stratum corneum is not yet fully developed, the dermis is thin, collagenous tissue is sparse, and the capillary network is well-formed. Upon delivery—from the amniotic fluid environment into a dry external setting—even minor stimuli (e.g., clothing or topical medications) can trigger cutaneous vasodilation, resulting in polymorphic, ill-defined erythematous patches of varying sizes. This phenomenon, known as “erythema toxicum neonatorum” (or neonatal erythema), represents a normal physiological adaptation to environmental transition.
Eczema
Red patches on an infant’s face may also indicate eczema. Given its multifactorial etiology, eczema presentation varies significantly depending on the child’s age, affected anatomical site, and environmental or seasonal factors. Clinically, it is commonly classified into three types: seborrheic, exudative, and xerotic (dry). Intense pruritus often leads infants to scratch, potentially causing erosion, oozing, crusting, and—in severe cases—widespread involvement of the scalp, entire face, or even the whole body. Secondary bacterial infection may manifest as pustules, regional lymphadenopathy, and fever. As eczema can cause significant skin damage, prompt medical evaluation and treatment are strongly recommended.
Care and Management
Neonatal erythematous patches typically appear on the face, extremities, and trunk. They may occur singly or coalesce into larger areas, often fading within hours—though new lesions may continue to emerge. Importantly, affected infants usually remain otherwise healthy: alert, afebrile, feeding normally, and requiring no specific intervention. For optimal care, all newborn items—including clothing and bedding—should be soft, clean, and minimally irritating. When laundering, ensure thorough rinsing to remove all chemical detergent residues. Bathing should ideally use a mild, pH-neutral cleanser; in many cases, plain water suffices, and routine use of bath products is unnecessary—residual surfactants may irritate the infant’s sensitive skin.
We hope this information is helpful. Wishing you a joyful and fulfilling parenting experience!
