Genital herpes typically appears as small, fluid-filled blisters that form in clusters around the genitals or anus. These blisters break open within a few days, leaving shallow, painful sores (ulcers) that eventually crust over and heal. The appearance changes significantly depending on the stage of an outbreak and whether it’s your first episode or a recurrence.
What the Sores Look Like at Each Stage
An outbreak moves through a predictable sequence, and the sores look different at each point.
Before anything visible appears, many people feel a tingling, burning, or itching sensation in the area where sores are about to form. This is called the prodromal phase, and it can start a few hours to a couple of days before blisters show up. The skin may look slightly red or irritated, but there’s nothing obviously wrong yet.
Next come the blisters themselves: small, round, fluid-filled bumps that tend to cluster together. They’re usually 1 to 3 millimeters across and sit on a red base. The fluid inside is typically clear or slightly yellowish. These blisters are fragile and often break open on their own within a day or two, which leads to the most painful stage: open ulcers. The ulcers look like shallow, wet, raw patches of skin. They may weep clear fluid and can merge together into larger sores when there are several in one area.
Over the following days, the ulcers dry out and form yellowish or brownish crusts. Once crusted, they’re in the final stage of healing. No scarring is typical, and the skin returns to normal once the crust falls away.
First Outbreak vs. Later Ones
A first outbreak is almost always the worst. It tends to produce more blisters spread over a larger area, and the sores are more painful and take longer to heal. The first episode can last 2 to 4 weeks from the appearance of the first blister to full healing. It often comes with body-wide symptoms too: fever, body aches, swollen lymph nodes in the groin, and a general feeling of being unwell. These flu-like symptoms don’t usually return with later outbreaks.
Recurrent outbreaks are shorter and milder. Sores typically heal within 3 to 7 days, and there are fewer of them. Many people notice that recurrences happen in the same spot each time and become less frequent over the years. HSV-2, the strain responsible for most genital herpes cases, tends to recur more often than genital infections caused by HSV-1. Some people with genital HSV-1 may have one outbreak and never have another.
Where the Sores Appear
In women, blisters and ulcers commonly show up on the vulva, around the vaginal opening, on the buttocks, or near the anus. Sores can also develop on the cervix, where they aren’t visible without an exam but may cause unusual discharge or discomfort. In men, the most common locations are the shaft and head of the penis, the foreskin, and the scrotum. Both men and women can develop sores on the thighs, buttocks, and around the anus regardless of the type of sexual contact involved.
When It Doesn’t Look “Typical”
Not every case of genital herpes produces the classic cluster of blisters. In fact, most people with herpes don’t know they have it because their symptoms are so mild. Some people experience only a small crack or fissure in the skin that looks like a paper cut. Others notice a patch of redness or irritation that could easily be mistaken for chafing, a yeast infection, or razor burn. These atypical presentations are a major reason herpes spreads so easily: the sores don’t always look like what people expect, and the virus can be passed along even when no visible symptoms are present at all.
How It Differs From Similar Conditions
Several other conditions can look like herpes at first glance, so visual identification alone isn’t reliable.
- Syphilis sores are usually a single, firm, painless ulcer with a clean, smooth base. Herpes lesions are typically multiple, soft, and painful.
- Ingrown hairs or folliculitis appear as red bumps centered around a hair follicle, often with a white head. They don’t cluster and don’t form the shallow, wet ulcers that herpes does.
- Contact dermatitis causes widespread redness and itching but doesn’t produce distinct, grouped blisters that ulcerate and crust.
The only way to know for sure is testing. The most accurate option is a nucleic acid amplification test (a swab of an active sore analyzed for viral DNA), which has a sensitivity between 91% and 100%. Traditional viral cultures are less reliable, especially once a sore has started to heal or crust over. Blood tests can detect antibodies to HSV-1 or HSV-2 but can’t tell you where on the body the infection is.
What Healing Looks Like
Once the open ulcers dry and crust over, the worst of the pain subsides. The crusts gradually fall off over several days, revealing pink or slightly discolored skin underneath. This new skin may look a shade lighter or darker than the surrounding area for a few weeks, but permanent scarring is rare. Antiviral medication, if started early in an outbreak, can shorten healing time by a day or two and reduce the severity of symptoms. Without treatment, a first outbreak resolves on its own within about 2 to 4 weeks, and recurrent episodes clear within about a week.