Quick Summary
- Hand, foot, and mouth disease (HFMD) causes small blisters concentrated on the hands, feet, and inside the mouth, along with mouth sores that can make eating painful.
- Chickenpox causes itchy blisters that appear all over the body in waves, typically starting on the trunk or face and spreading outward.
- HFMD is caused by coxsackievirus; chickenpox is caused by the varicella-zoster virus.
- Chickenpox spots go through a distinct "dew drop on a rose petal" progression — clear blister, cloudy, then crusted — over about a week.
- Chickenpox is now uncommon in vaccinated children, so a widespread itchy, blistering rash in an unvaccinated child should prompt a call to the pediatrician.
Both hand-foot-mouth disease and chickenpox are common childhood viral illnesses that cause blister-like spots, which makes them easy for worried parents to mix up — but the distribution pattern and accompanying symptoms usually make the distinction fairly clear.
What Hand, Foot, and Mouth Disease Looks Like
Hand, foot, and mouth disease (HFMD) is caused by coxsackievirus and is common in young children, especially in daycare and school settings. As the name suggests, it causes small, sometimes painful blisters concentrated on the palms of the hands, soles of the feet, and inside the mouth — mouth sores can make eating and drinking uncomfortable, which is often the most disruptive symptom for young kids. A mild fever often precedes the rash by a day or two. Spots can occasionally appear on the buttocks or legs as well, but the hands-feet-mouth distribution is the defining pattern.
What Chickenpox Looks Like
Chickenpox, caused by the varicella-zoster virus, produces widespread, intensely itchy blisters that typically start on the trunk or face and spread outward to the rest of the body, including the scalp. A hallmark feature is that chickenpox spots appear in successive waves and go through a recognizable progression — often described as "dew drops on a rose petal" — from a small red bump, to a clear fluid-filled blister, to a cloudy blister, to a crusted scab, all within about a week. Because of this staggered timing, you can often see spots at several different stages simultaneously.
Key Differences at a Glance
| Feature | Hand, Foot, and Mouth Disease | Chickenpox |
|---|---|---|
| Distribution | Hands, feet, and inside the mouth | Widespread — trunk/face outward to whole body |
| Itchiness | Usually mild, mouth pain is the bigger issue | Intensely itchy |
| Cause | Coxsackievirus | Varicella-zoster virus |
| Progression | Blisters appear relatively together | Waves of spots at different stages at once |
| Vaccine available? | No | Yes — chickenpox is now uncommon in vaccinated kids |
Why This Distinction Still Matters
Because the chickenpox vaccine is part of the routine childhood immunization schedule, true chickenpox is now much less common than it used to be — a widespread, itchy, blistering rash in an unvaccinated or under-vaccinated child is worth a prompt call to the pediatrician. HFMD, while very common and usually mild, is also worth confirming, both for comfort management (mouth pain can lead to dehydration if a child won't drink) and to know how long to keep a child home from daycare or school.
Have questions about a rash on your child?
Our board-certified dermatologists see patients at our Burien and Bellevue offices — same-week appointments are often available.
Schedule a Skin CheckWhen to See a Doctor
See a pediatrician for a new widespread rash in a child, especially with fever, mouth sores affecting eating/drinking, or if you're unsure of the child's vaccination status. Dermatology involvement is occasionally helpful for unusual or prolonged rashes, but these two conditions are typically managed by a pediatrician first.