Hand, foot, and mouth disease (HFMD) starts with a low fever and sore throat, then produces painful blisters inside the mouth and a distinctive rash on the palms of the hands and soles of the feet. The rash appears as small, flat spots or bumps that can develop into fluid-filled blisters. Depending on skin tone, the spots may look red, white, gray, or simply show up as tiny raised bumps.
How the Rash Looks on Hands and Feet
The hallmark of HFMD is blister-like lesions on the palms and soles. These start as small, flat pink or red spots, then raise into firm bumps or fluid-filled blisters over a day or two. On lighter skin, the spots tend to appear red or pinkish. On darker skin tones, they may look grayish, white, or blend in more with surrounding skin, making them harder to spot visually. In that case, you might feel the bumps before you clearly see them.
The rash is typically not itchy, which surprises many parents who assume any rash with blisters must itch. The blisters are small, usually a few millimeters across, and can appear on the fingers, the backs of the hands, and around the edges of the feet as well as the soles. In some cases, the rash also spreads to the buttocks, knees, elbows, and genital area.
What the Mouth Sores Look Like
Before the skin rash appears, painful sores usually develop inside the mouth. They start as bright pink spots or tiny bumps on the tongue, gums, inner cheeks, or the roof of the mouth, then progress into open blisters or shallow ulcers. These sores look somewhat like canker sores but tend to appear in clusters rather than alone. They make eating and drinking painful, especially for young children, which is often the symptom that prompts a parent to look more closely.
Oral blisters are present in roughly two-thirds of HFMD cases, making them one of the most reliable visual markers of the illness.
How Symptoms Progress Day by Day
HFMD typically unfolds in two stages. The first stage feels like a mild flu: low fever, sore throat, runny nose, stomachache, and loss of appetite. This lasts about one to two days.
After that initial phase, the second stage brings the visible signs: mouth sores appear first, followed by the skin rash on the hands, feet, and sometimes other areas. Swollen lymph nodes in the neck may also develop. The entire illness usually clears up on its own within seven to ten days, with the blisters gradually flattening and fading without scarring.
How It Differs From Chickenpox
Because both illnesses produce blisters, HFMD and chickenpox are easy to confuse, especially early on. The key differences come down to location and itch. HFMD blisters concentrate on the hands, feet, and mouth, with limited spread elsewhere. Chickenpox produces a widespread rash across the entire body, particularly the trunk, and the lesions go through visible stages (flat spots, raised bumps, fluid-filled blisters, then crusts) all at the same time in the same area.
Chickenpox is also intensely itchy. Over 90% of chickenpox cases involve significant itching, compared to roughly half of HFMD cases. If your child has painful mouth sores plus a rash focused on the limbs and palms, HFMD is far more likely than chickenpox.
Atypical Cases With a Wider Rash
Not every case of HFMD stays neatly on the hands, feet, and mouth. A strain called Coxsackievirus A6 can cause a more dramatic presentation: a widespread rash covering the arms, legs, trunk, buttocks, genital area, and the skin around the mouth. The blisters may look more like chickenpox, sometimes described as a “varicella-like” rash, which makes diagnosis confusing even for doctors.
These atypical cases tend to be more visually alarming but still follow the same general course. The rash resolves on its own, though the illness can be somewhat more severe, occasionally causing dehydration from the pain of mouth sores. If the rash is widespread but your child also has obvious mouth blisters and a recent low fever, HFMD caused by this strain is a strong possibility.
What Adults See When They Get It
Adults can and do catch HFMD, though many assume it’s exclusively a childhood illness. The rash looks the same in adults: blister-like lesions on the palms, soles, and sometimes the buttocks, along with painful mouth sores. Some adults develop a milder version with only a few scattered bumps, while others experience more discomfort than a typical child case because the mouth sores can be particularly painful in adults. Adults are most contagious during the first week of illness but can continue shedding the virus in stool for days or weeks after symptoms resolve.
Nail Changes Weeks Later
One surprising aftereffect catches many people off guard: fingernails or toenails can start peeling or shedding weeks after the illness has passed. This typically happens four to six weeks after the initial infection. The nails may lift from the nail bed, develop horizontal grooves, or partially fall off. It looks alarming, but the nails grow back normally without treatment. This was documented in a case where a seven-year-old boy’s nails began shedding three weeks after recovering from HFMD, with the shedding continuing for several weeks before new, healthy nails replaced them.
If you notice nail changes a month or two after a bout of HFMD, the two are almost certainly connected, and the nails will recover on their own.