Hand, foot, and mouth disease (HFMD) typically looks like flat or slightly raised red spots that sometimes develop into small blisters with a red base. These spots appear on the palms, soles of the feet, inside the mouth, and sometimes on the buttocks. On darker skin tones, the same rash may appear white, gray, or show up only as tiny bumps rather than obviously red spots.
The Rash on Hands and Feet
The most recognizable feature of HFMD is a rash on the palms of the hands and the soles of the feet. It starts as small, flat red spots that may develop into fluid-filled blisters over one to two days. Each blister sits on a reddened base, giving it a target-like appearance. The blisters are usually small, roughly the size of a pencil eraser or smaller.
One helpful detail: this rash is usually not itchy. That alone separates it from many other childhood rashes. The spots can also appear on the backs of the hands, the tops of the feet, and on the knees, elbows, or buttocks. In most cases, the blisters dry up and fade on their own within 7 to 10 days without scarring.
Mouth Sores
Before or alongside the skin rash, painful sores develop inside the mouth. These typically show up on the tongue, gums, inner cheeks, and the roof of the mouth. They start as small red spots and quickly become shallow ulcers that look similar to canker sores. In a study comparing HFMD with chickenpox, about 64% of HFMD patients had oral or throat blisters, nearly double the rate seen with chickenpox.
These mouth sores are often the most uncomfortable part of the illness, especially for young children. They can make eating, drinking, and swallowing painful, which is why dehydration is one of the main concerns. The sores usually heal within a week.
How It Looks on Different Skin Tones
On lighter skin, the rash appears as clearly red spots or blisters. On medium to darker skin tones, the rash may look white, gray, or slightly purple rather than red. In some cases, it shows up only as small raised bumps without obvious color change. This can make HFMD harder to spot, so feeling the skin for tiny bumps on the hands and feet can help when color changes aren’t obvious.
How to Tell It Apart From Chickenpox
HFMD and chickenpox can look similar at first glance, but a few visual clues help separate them. HFMD concentrates on the hands, feet, and around the mouth. Chickenpox tends to spread across the whole body, starting on the trunk and moving outward. In one clinical comparison, over half of chickenpox patients had rashes covering the whole body, while HFMD patients most often had rashes limited to the limbs and perioral area.
The itch factor is another clue. Chickenpox is intensely itchy in over 90% of cases, while HFMD rarely itches. Chickenpox also produces crops of blisters at different stages simultaneously, so you’ll see fresh spots, mature blisters, and crusted-over lesions all in the same area. HFMD blisters tend to appear at roughly the same stage.
Atypical Cases That Look More Severe
A strain called Coxsackievirus A6 can cause a version of HFMD that looks dramatically different from the classic presentation. Instead of small, localized blisters, this strain can produce large, widespread blisters that extend to the face, ears, trunk, and neck. In children with eczema, the virus can settle into patches of existing skin irritation, creating a condition sometimes called eczema coxsackium, where clusters of blisters concentrate in areas already affected by eczema.
Some atypical cases also produce purplish or bruise-like spots instead of the classic red-based blisters. These purpuric lesions can appear around the mouth, on the buttocks, and on the hands and feet. Because these unusual presentations can resemble more serious conditions like widespread herpes infections or severe drug reactions, they sometimes require a lab test to confirm the diagnosis.
Nail Changes Weeks Later
One of the more surprising aftereffects of HFMD is nail shedding, which can start four to six weeks after the illness. The medical term is onychomadesis. It typically begins with a gray-white patch at the base of the nail that gradually spreads. Over the course of about two weeks, the nail separates from the base and peels away partially or completely. Multiple fingernails and toenails can be affected at once.
Before full shedding, you might notice horizontal grooves running across the nail plate, known as Beau lines, or a cloudy gray-white discoloration. This looks alarming, but it’s harmless. New, thin pink nails grow in slowly beneath the shedding ones. The process requires no treatment, and nails typically return to normal within a few months.
The Typical Timeline
The first signs of HFMD are usually a fever, sore throat, and general fussiness in young children. Within a day or two, the mouth sores appear. The skin rash on the hands, feet, and sometimes buttocks follows within another day or two. So from the first fever to the full rash, you’re looking at roughly two to four days.
The blisters and sores peak around days three to five of the rash, then gradually dry out and fade. Most children are fully recovered within 7 to 10 days. The illness is most contagious during the first week, particularly while blisters are present, though the virus can linger in stool for weeks after symptoms resolve.