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Q: My toddler has on-and-off vomiting and a blistery rash all over his body and in his mouth. What could be wrong?

  • Myeongchan Kim
  • Sep 16, 2025
  • 2 min read

This post is a dramatization of a question and answer session experienced by our actual medical reviewers. Please note that this content is for informational purposes only and does not constitute medical advice. Always consult with a qualified healthcare professional for any health concerns or before making any decisions related to your health or treatment.


Question: My son, who is almost 2, started vomiting about a week ago. We took him to a clinic and then a doctor, who prescribed Vermox. The vomiting stopped for a bit but then returned. He also developed a rash with blisters all over his body, including in his mouth. The vomiting is on and off, and I don't know what to do. What could be causing this?


Answer: Hey there, I’m so sorry to hear what your little one is going through. It must be so tough to see your child uncomfortable and not know exactly what’s going on. You’re doing a great job staying on top of things and seeking advice, so let’s try to figure this out together

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What Could Be Happening

Your baby’s symptoms—vomiting, rash with blisters, and mouth lesions—can be caused by a few different things:

* Viral Gastroenteritis: This is a common cause of vomiting in kids. Sometimes it comes with fever, diarrhea, or belly pain, but it usually improves within a couple of days. Staying hydrated is really important here. * Allergic Reaction: The rash and blisters might be a reaction to something—maybe even the Vermox. If the rash is widespread or the blisters are severe, it’s worth getting this checked ASAP. * Hand, Foot, and Mouth Disease (HFMD): Blisters in the mouth and a body rash are often caused by this viral infection. It’s uncomfortable but usually goes away on its own with good hydration and symptom management. * Something More Serious: In rare cases, a combination of these symptoms could point to a more serious issue, like a bacterial infection or a severe allergic reaction.


What You Can Do Right Now

* Keep Your Baby Hydrated: Small sips of oral rehydration solution (ORS) or even plain water are super important. Watch for signs of dehydration, like dry lips, fewer wet diapers, or a sunken soft spot. * Stop Any Medications: If you think Vermox or anything else might have made things worse, hold off and let your doctor know. * Manage the Rash: Keep it clean and dry. Avoid scratching the blisters, and ask your doctor if a soothing cream or antihistamine might help.


When to See a Doctor

Since your baby’s symptoms have been coming and going for a while now, it’s definitely worth getting a second look. Go to a doctor right away if:

* Vomiting doesn’t stop or gets worse, especially with dehydration signs (dry mouth, fewer wet diapers). * The rash or blisters spread, get worse, or look infected. * Your baby has a high fever or seems unusually drowsy, irritable, or uncomfortable. * Vomit is green (bile-stained) or bloody.



For extra peace of mind and clear guidance when tracking your child's symptoms, the FeverCoach app is always there to help.






 
 
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