The most important thing first. Nappy rash is very common and mostly dealt with at home — but what makes it better is skin kept DRY and CLEAN, not more things put on it. Two situations change the level of urgency entirely: the baby has a fever, and the rash has appeared in a baby in the first weeks of life.
Recognising nappy rash: what the nappy edge tells you
According to NHS, nappy rash is red or raw patches on the bottom or over the whole nappy area, sometimes with small spots, bumps or blisters, with the skin peeling and dry, and the baby sore or itchy and therefore unsettled. Those spots are harder to see on brown and black skin, according to NHS — do not conclude “no rash” because you have just had a look in a dim room.
- THE NAPPY EDGE IS THE EASIEST MARKER. According to MedlinePlus, nappy rash does not usually spread beyond the nappy area.
- According to MedlinePlus, the rash is a bright red area that widens; the genital area can also be very red and scaly.
- SMALL SEPARATE RED PATCHES around the main one — MedlinePlus calls them satellite lesions — which grow and merge into the larger patch. That pattern points towards a yeast and needs a doctor to look.
- The direction matters more than a photograph of one day: compared with yesterday, is it shrinking or widening?
What it is mistaken for
- HEAT RASH comes from heat and blocked sweat glands, and tends to appear on the neck, the chest, the back and where clothing is tight — a completely different mechanism from the damp-and-rubbing of nappy rash. Heat rash has its own article on this site.
- A YEAST does not rule nappy rash out; it is ONE OF ITS CAUSES: according to NHS, thrush is on the list of things that cause nappy rash. Telling them apart and deciding whether to use an antifungal is a doctor's job; fungal skin infection has its own article on this site.
- SCABIES causes fierce itching and everyone in the household itching in turn, and also has its own article on this site.
- According to NHS, diarrhoea, or an illness that makes a baby pass stool many times a day, also causes nappy rash.
What to do straight away
- Change a wet or dirty nappy as soon as you can — according to NHS this is the first thing to do.
- Clean with water, or with fragrance-free and alcohol-free wipes. According to NHS, wipes with fragrance or alcohol are themselves one of the causes of the rash.
- Keep the skin clean and DRY: according to NHS, pat or wipe gently dry, and do not rub.
- LEAVE THE NAPPY OFF whenever you can — both NHS and MedlinePlus say so.
- Use nappies that absorb well, fastened snugly rather than tightly; with cloth nappies, NHS advises dry liners changed frequently.
- According to NHS, bathing the baby once a day is enough — washing too often dries the skin out.
- According to NHS, if the rash is making the baby sore, a pharmacist may suggest a THIN layer of barrier cream at each nappy change to protect the skin. According to MedlinePlus, ones containing zinc oxide or petroleum jelly keep moisture away from the skin, and they go on skin that is clean and completely dry.
- Keep a note by the day: is the rash shrinking or widening? Take the tube you have been using with you to the appointment.
What must NOT be done
- DO NOT USE TALCUM POWDER. According to MedlinePlus, do not use talc because it can get into a baby's lungs. According to NHS, do not use talcum powder, or antiseptic creams and solutions, on the rash either. (Talcum powder and HEAT RASH is a different question, and the heat-rash article has a section of its own on it — but for nappy rash both sources say don't.)
- DO NOT use soap, bubble bath or baby lotion on the rash — according to NHS they irritate the skin.
- DO NOT fasten the nappy tightly, and DO NOT put plastic pants or a nylon cover over it; according to NHS both irritate the skin.
- DO NOT buy a corticosteroid cream or an antifungal and put it on a child yourself. According to NHS, corticosteroid ointment, antifungal cream and antibiotics are things a doctor PRESCRIBES after examining the baby.
- DO NOT apply it thickly — according to NHS it is a THIN layer; thicker does not protect better.
When you must go to hospital
GO TO EMERGENCY CARE or call 115 (the emergency number in Vietnam) NOW if the baby has ANY of the following — according to NHS this is the group of signs of a seriously unwell child, and at that point the skin is no longer the main issue: lethargy, hard to wake, not rousing when called; not responding as usual, refusing the breast, taking no interest in feeding or in what they normally do; crying that cannot be soothed; difficulty breathing, grunting breaths, the belly drawing in under the ribs on breathing, breathing very fast; skin or lips blue, grey or paler than usual, or skin that is mottled — harder to see on brown and black skin; hands and feet unusually cold; a seizure; a fever in a baby under three months old, because at that age any degree of fever is a reason to call at once. — BE SEEN WITHIN 24–72 HOURS if: the rash has appeared in a baby in the first six weeks of life; a baby older than three months has a fever; the rash is getting worse or not improving; the rash is spreading onto the tummy, the back, the arms or the face; there are pustules, blisters, ulcers or large bumps; the baby is very sore or unusually unsettled. — The younger the baby, the further towards the early end of that range you should lean. If you are not sure, ring and ask before deciding for yourself.
Nappy rash belongs to the skin of small children, and we do NOT take on home care for small children or newborns. At home it is not possible to tell ordinary nappy rash from one that has become infected with a yeast or with bacteria, and we are not a substitute for the child's own appointment at a medical facility. The two things Y Te Xanh (GreenCare) can do are a remote consultation by video call so you can decide between being seen now and waiting for an appointment, and a doctor coming to the house to take the history and examine. With a sign in the box above, go in first and call afterwards.
The signs, the things to do and not do, the causes and the points for being seen follow the publicly available NHS page on nappy rash; the group of signs of a seriously unwell child follows the NHS page on fever in children. The nappy edge, satellite lesions and the warning about talc follow MedlinePlus. The US CDC has no general-public page on nappy rash, so this article cites no CDC material. Citing NHS and MedlinePlus here does not imply that those bodies endorse Y Te Xanh or our services.
Need personalised advice for your loved one? Call our hotline 094 368 81 15 (24/7) — calling to ask a question or to book costs nothing. GreenCare has doctors who come to examine, nurses who carry out doctor's orders (injections, infusions, dressing changes), remote consultation by video call, and a review of the medicines you are taking; an in-depth remote consultation, or any one after the first, is a paid service. For children we take examination and acute care only — not long-term care at home, and not newborns or expectant mothers. We confirm we have staff in your area and provide transparent pricing before we begin.
Sources
- NHS — Nappy rash
- MedlinePlus — Diaper rash
