Concentration of immature blood vessels causes salmon patches on the nape of the neck and on the eyelids of a newborn.
Bruising would appear more bluish-purple rather than like salmon patchwork. The Harlequin sign, which is frequently observed in neonates with low birth weight, is the result of immature autoregulation of blood flow. A salmon-colored response would not be an allergic reaction; it would be more widespread.
Erythema toxicum, which can arise between two days and two weeks after delivery, is a common skin response in infants. Flat, red spots or tiny pimples frequently start on the face before spreading to the torso and limbs. The rash will go away within a few days to a week, is not infectious, and is harmless.
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