REASSURE, NAME THE RASH, AND EXCLUDE THE DANGEROUS LOOK-ALIKES (RECOGNITION & ADVICE)
Erythema Toxicum - StatPearls (NCBI Bookshelf NBK470222) - https://www.ncbi.nlm.nih.gov/books/NBK470222/
Two rashes that need nothing, on one card, for one reason: the whole clinical job here is telling them apart from sepsis and from herpes. No drug is offered because the articles state none, and because putting something on the skin is the specific thing the parents are told not to do.
- ERYTHEMA TOXICUM - WHAT IT LOOKS LIKE - firm papules or pustules, yellow-white, 1 to 3 mm across, each sitting on a ragged patch of red skin; the article's image for it is a papule set in a sea of redness. And they travel: an individual spot often fades within hours and turns up somewhere else, which is itself the clue.
- THE TIMING AND THE SPARED AREAS ARE THE DIAGNOSIS - it appears in the first week after birth and clears, as a rule, in 7 to 14 days. Palms and soles are left alone, and that fits: the eruption follows where the hair follicles are, and there are none there. A rash on the palms and soles is a different problem.
- THE BABY MUST BE WELL - nothing systemic goes with it; the baby is otherwise entirely well. A newborn with a rash AND fever, poor feeding, lethargy or hypothermia is being assessed for sepsis, not for erythema toxicum. The article's own differential opens with sepsis.
- THE LOOK-ALIKES THAT MUST BE EXCLUDED - in some babies, varicella-zoster and herpes simplex have to be excluded first, and a fungal cause is excluded with nothing more elaborate than a potassium hydroxide preparation. Grouped vesicles, an unwell baby, or maternal genital herpes make this a same-day paediatric problem.
- TREATMENT IS WORDS, NOT CREAM - the treatment is explaining to the parents how this runs its course: harmlessly, and away to nothing, leaving no mark behind. Washing should be gentle, with something made for sensitive skin. Two things do real harm here and the parents should AVOID both - handling the baby's skin too much, and putting creams on it, which will only irritate it further.
- AND SAY WHOSE FAULT IT IS NOT - say plainly that neither dirt nor allergy caused this. In a Cairo clinic that sentence prevents a week of scrubbing, oils and changed formula.
- MILIA - THE OTHER ONE PARENTS BRING IN - a milium is a tiny keratin cyst sitting just under the epidermis, harmless and short-lived; several of them at once show as small, firm, white papules, most often on the face. Where to look: the cheeks, the eyelids, the nose, the scalp - and inside the mouth, where they carry their own names, Bohn nodules along the gum and Epstein pearls on the palate. So the white dots on the gum and palate need nothing.
- MILIA NEED NO TREATMENT EITHER - the congenital ones call for no specific treatment at all, because they go by themselves. Expect them gone in a couple of weeks, leaving no scar, and most have disappeared inside the first month; a few will hang on for several months. Do not squeeze them.
- WHEN TO BRING THE BABY BACK - instruct the parents, and whoever else minds the baby, to come back for review on any of three triggers: a rash that does not look like the one described, a rash still there long after it should have gone, or a baby who becomes unwell alongside it. Anything on that list means another diagnosis has to be excluded. Give the instruction out loud; a benign label handed over without a return trigger is how a septic newborn gets sent home.
- OLDER OR SPREADING MILIA ARE NOT THE NEWBORN KIND - the article separates them. Secondary milia, the acquired sort, turn up in older children instead, and the history may include an injury to the skin, or a blistering disease of it. Left alone, this kind can stay. Blistering skin in a child is a dermatology referral, not a reassurance visit.