Herpes sores typically appear as small, fluid-filled blisters that cluster together on or around the mouth, genitals, or surrounding skin. The fluid inside is usually clear or slightly yellow, not white like a pimple. Over the course of a few days to a few weeks, these blisters break open, ooze, form shallow ulcers, and eventually crust over before healing. What the sores look like depends on which stage of the outbreak you’re seeing, whether it’s your first outbreak or a repeat one, and where on the body they appear.
Herpes is extremely common. According to 2020 estimates from the World Health Organization, roughly 846 million people between ages 15 and 49 are living with genital herpes globally, which is more than 1 in 5 adults in that age group.
The Four Stages of an Outbreak
A herpes outbreak follows a predictable visual sequence, though the timeline can vary from person to person.
Prodrome (no visible sores yet): Before anything appears on the skin, you may feel tingling, burning, or itching at the site where the virus entered your body. Some people also feel aching in the lower back, buttocks, or thighs. This stage can last a few hours to a day or two. The skin may look normal or slightly red.
Blistering: Small blisters filled with clear fluid form in a cluster. They tend to feel squishy to the touch, not firm like a pimple. Individual blisters are usually just a few millimeters across, but they can merge together. They’re often itchy and painful.
Ulceration: The blisters rupture and release their fluid, leaving behind shallow, open sores that may ooze or bleed slightly. This is usually the most painful stage and is also when the virus is most easily spread. The raw ulcers can look red or pinkish.
Crusting and healing: The open sores dry out and form scabs. Blisters on moist areas like inside the mouth or on the genitals may not develop a visible crust the way sores on drier skin do. The scabs eventually fall off, and new skin forms underneath. Herpes sores generally heal without leaving a scar, though blisters from a first outbreak may take up to four weeks to resolve completely.
Oral Herpes vs. Genital Herpes
Both HSV-1 and HSV-2 can cause sores in either location, but the patterns differ. Oral herpes, commonly called cold sores or fever blisters, usually appears on or around the lips, the corners of the mouth, or less commonly inside the mouth and throat. The blisters tend to cluster on one side, often in the same spot each time.
Genital herpes sores show up on the vulva, vagina, cervix, penis, scrotum, anus, buttocks, or inner thighs. On external skin, they look much the same as oral sores: grouped blisters that break open and crust over. On internal mucosal surfaces like the vaginal walls or cervix, sores may appear as small red bumps or shallow ulcers rather than obvious blisters, since moist tissue doesn’t blister the same way dry skin does. These internal sores can be easy to miss, which is one reason many people don’t realize they have herpes.
First Outbreak vs. Recurrences
A first herpes outbreak is almost always the worst one. It can produce widespread, painful ulcers that take weeks to heal, sometimes with flu-like symptoms including fever, swollen lymph nodes, and body aches. The sores may be more numerous and cover a larger area than in later episodes.
Recurrent outbreaks are generally milder and shorter. You may see only a few small blisters that heal in a week or so. Over time, outbreaks tend to become less frequent. Genital herpes caused by HSV-1 recurs less often than genital herpes caused by HSV-2, and for both types, the frequency of outbreaks drops during the first year after infection.
What Herpes Doesn’t Look Like
Because herpes blisters can resemble other skin conditions, it helps to know the differences.
- Pimples are firm, round, and filled with white pus that may darken when exposed to air. They sit deeper in the skin because they form inside pores. Herpes blisters, by contrast, are softer, filled with clear or yellowish fluid, and sit closer to the skin’s surface. Pimples are painless unless squeezed, while herpes sores hurt on their own.
- Ingrown hairs form around a hair follicle and are usually single, firm bumps. They’re most common in areas that are shaved, waxed, or plucked, especially in people with thick or curly hair. They don’t cluster or follow the blister-to-ulcer-to-crust progression.
- Folliculitis is a bacterial or fungal infection in a hair follicle that can fill with pus, swell, and itch. It looks more like a scattering of individual whitehead pimples centered on follicles rather than a tight cluster of clear blisters.
- Contact dermatitis causes redness, itching, and sometimes small bumps from exposure to an irritant or allergen like a new soap, laundry detergent, or latex. It tends to affect a broader, more uniform patch of skin rather than forming distinct blisters in a cluster.
- Syphilis sores (chancres) are typically single, firm, round, and painless. They don’t cluster, don’t itch, and don’t form the weepy, crusting blisters characteristic of herpes.
Atypical Presentations
Not every herpes outbreak looks like a textbook case of clustered blisters. Some people develop only a small crack or fissure in the skin that looks like a paper cut. Others may have redness and irritation without any visible blisters at all. These subtle presentations are easy to mistake for a yeast infection, razor burn, or general skin irritation, which is part of why herpes is so widely underdiagnosed.
Sores can also appear in unexpected locations: on the buttocks, lower back, or thighs rather than directly on the genitals or mouth. In people with weakened immune systems, herpes lesions can become chronic, lasting a month or longer, and may take on unusual forms like raised, wart-like growths or deeper ulcers that bleed easily. These atypical cases often need a swab test or blood test to confirm what’s actually going on.
How Long Sores Last
For a first outbreak, sores can persist for two to four weeks from the time they appear until the skin fully heals. Recurrent outbreaks are shorter, with most sores healing within one to two weeks. Antiviral medication, if started early (ideally during the prodrome stage), can shorten the duration and reduce severity. Without treatment, the sores still heal on their own since herpes outbreaks are self-limiting, but they take longer and tend to be more painful.
Between outbreaks, the skin looks completely normal. The virus retreats into nerve cells and stays dormant until something triggers it to reactivate, which is why herpes sores come and go in the same general area rather than spreading to new parts of the body over time.