My baby's diaper rash has open sore spot

I'll check the family record and the right care cards first.

Call your baby's doctor and book an appointment within the next 24 hours for the open sore spots — open skin that is spreading despite barrier cream is the point where nappy rash stops being a "just keep changing her" problem and becomes something a clinician needs to look at, and the appointment can wait for a routine slot rather than an emergency one only if none of the red flags below are present tonight.

I am not a clinician and I cannot tell you by message which of the usual causes this is. What I can tell you is that a rash this far along has usually moved past simple irritation, and the things a clinician sorts out on the skin are: ordinary irritant nappy dermatitis, a fungal (thrush-type) rash that behaves differently from irritation, a secondary bacterial infection in the broken skin, or something else that needs looking at directly. That is exactly why the appointment matters — the treatment for each is different, and none of them should be guessed at from a message or from what is in the medicine cabinet.

The one question that changes tonight's urgency: how old is she, in months? If she is under 3 months, or under 2 months, tell the clinic that on the phone and let them decide how fast they want to see her.

1) What you have already tried, and the better alternative

Two more levers that cost nothing:

• Change more often. A super-absorbent nappy left in until it's heavy is one of the most common aggravators. If she is being left in a heavy nappy at night, that is worth fixing first.
• Loose clothing, no plastic-lined trousers over the area, and let her bottom stay uncovered on the sofa/floor when she is awake.

For the crying: any pain medicine she gets must come from her own doctor or the package label, calculated for her weight — I will not give you a number. Many caregivers find the nappy change itself is the painful moment, so the 5–10 minutes of air time *before* cleaning, and patting rather than wiping, is the part that buys you both of you a calmer night.

What to have ready for the appointment (this is the part that makes the visit short): timed photos on your phone with the date visible — one wide shot of the whole nappy area, one close of the sores, one of each inner thigh; the barrier paste itself in its tube; the list of everything you have used in the last week and how often; her age in months; her usual wet nappies and feeds over the last 24 hours; her immunisation status; and any medicines given.

2) Avoid list — things not to put on that skin

• No scented wipes, wipes containing alcohol or fragrance, on open skin.
• No powders of any kind, including plain starch and talc.
• No leftover cream from anyone else, including antifungal, steroid, or antibiotic creams. Some of these help and some make a fungal rash worse — that is the clinician's call, not a guess.
• No online-prescription or steroid-antibiotic combination products.
• No scrubbing, no alcohol, no antiseptics dabbed into the sores.
• Nothing left sitting in a skin fold long after a change.
• Don't add a new food or a new product and expect to be able to tell which one did it — change one thing at a time from here, or you learn nothing.

3) Decision tree — what to do, and when to stop doing it at home

Tonight, check her whole body once, in good light, and answer four things:

1. Any temperature? Take it if you have a thermometer and note the time and how you took it.
2. Is she feeding and producing her usual number of wet nappies?
3. Are the sore spots weeping, crusted, or spreading past where they were yesterday?
4. Does she look or act unlike herself — floppy, hard to wake, unusually quiet, or unusually inconsolable?

If all four are clear → keep the barrier paste, more frequent changes, more air time, and call the doctor in the morning for an appointment today or tomorrow. Bring the photos. Do not start anything new on the skin tonight except what is already in the tube.

If she has a temperature, is feeding poorly or has fewer wet nappies than usual, or is harder to wake or flatter than normal → do not wait for the appointment. Phone your local urgent-care or out-of-hours medical line now, or take her to an urgent-care clinic today, and say: "baby, worsening nappy rash with open sores, and she now has a temperature / is feeding less."

Go to the emergency department or call your local emergency number now if any of these appear:

• The redness is spreading fast, is hot, swollen or shiny, or the edge moves noticeably over hours.
• Pain that is far worse than the rash looks, or she is screaming and cannot be settled.
• Blisters, or the skin peeling or sliding like a scald.
• She cannot drink or breastfeed at all, is limp or floppy, will not wake, or has a fit.
• Spots that do not fade when you press a clear glass firmly against them, especially with a temperature.
• Any white or blue colour around the lips, or laboured breathing.
• A swollen, red or painful scrotum or vulva.

One gap for the visit sheet: mark the outer edge of the red area with a pen and write the time next to it — if you do that in the morning, the doctor can see in one glance whether it has moved. It costs nothing and it does not delay the appointment.

What success looks like in 24 hours

Not a cure — nobody can promise that from a message, and I'm not going to. What you are looking for by tomorrow evening:

• No new open spots appearing after you changed the routine.
• The existing spots are not wider, and the skin around them is less red, not more.
• She settles more easily at changes and the night is less broken.
• She is feeding and wetting nappies as she normally does.

If none of that has happened by tomorrow evening, that is itself the answer: take her in anyway, and say "we did the gentle routine and it did not turn around in 24 hours." A rash that is not improving on simple, correct care is not a rash to watch for another week.

Scripts you can screenshot

To book (phone or message):
> "My baby has a nappy rash that's developed open sore spots on her inner thighs. She's [X] months old. We've been doing barrier paste at every change and air time, and it's getting worse over about [X] days. Can we see her today or tomorrow, and if not today, what should we watch for between now and then?"

To hand to whoever covers for you tonight (partner, elder, sibling):
> Open sores in the nappy area, getting worse. Doctor's booked/being booked for [DAY].
> 1. Leave the barrier paste on — don't wipe it all off. Just add more on top.
> 2. Water only on the skin, then pat dry. No scented wipes.
> 3. 5–10 minutes bare on a towel after each change, more often than usual.
> 4. Change her nappy more often, especially overnight.
> 5. Nothing new on the skin. No powders, no creams from anyone else, no leftover antifungal.
> 6. Call emergency services straight away if: redness spreads fast or gets hot and swollen, she is in real pain, blisters or peeling skin, she won't feed, she's floppy or hard to wake, spots don't fade under a glass, or breathing or lip colour changes.
> Photos are on the shared phone album under "nappy".

At the appointment, in one breath:
> "It started [date/time], spread from the nappy area onto both inner thighs, and has been open for [X] days. We've used [paste name] at every change and air time, and stopped scented wipes. I've been wiping off the paste — should I not have? No temperature until [time], feeding and nappies normal. First thing I want to know is: what is it, what should we put on it, and what would mean we come back straight away."

What I can't do: tell you which condition this is, recommend or change any cream or medicine for her, or give you a dose — that's a diagnosis and a prescription, and both belong to the clinician you're booking. And you haven't told me which country or city you're in, so I can't point you at a named local service; if you tell me the country, I can help you find the right door for the appointment and for out-of-hours cover.