A first herpes outbreak usually lasts a week or more: small blisters break into painful sores, then crust and heal over that span, sometimes with fever and swollen glands CDC. Repeat outbreaks are shorter and milder, and many people get a tingling warning (prodrome) before sores even appear.
NAAT or culture
not a cure
USPSTF Grade D
| Item | Value |
|---|---|
| Most people | mild / none |
| Test | swab a sore — NAAT or culture |
| Antivirals | control — not a cure |
| Screening | not advised — USPSTF Grade D |
How long a herpes outbreak lasts, stage by stage
The very first outbreak is the longest and roughest one most people will have. Blisters form on or around the genitals, rectum, or mouth, then break open into sores that can sting or burn, especially when urine touches them. Those sores take a week or more to crust over and heal. A true first episode often brings flu-like symptoms — fever, body aches, swollen glands in the groin — because the immune system is meeting the virus for the first time.
Recurrences run a gentler course. They're shorter and less severe, often a cluster of sores in one spot with no fever, and many are announced by a prodrome: a day or so of tingling, itching, or shooting pain in the area before anything is visible. How often this happens depends heavily on which virus you carry. Genital HSV-2 tends to recur about four times a year, while genital HSV-1 typically recurs roughly once in the first year and far less after that HSV-1 cohort.
There's no cure. The virus stays in your body for life, going quiet between episodes. Antivirals can shorten and soften an outbreak, but they don't clear the latent virus or change how often it comes back once you stop taking them CDC STI guidelines.
What a herpes outbreak actually looks and feels like
The symptoms move through predictable stages, and knowing them helps you tell an outbreak from something else:
- Prodrome — a tingling, itching, or aching feeling in the skin where sores will appear, often the earliest sign a recurrence is coming.
- Blisters — small fluid-filled bumps, sometimes in a tight cluster, that can be tender to the touch.
- Open sores (ulcers) — the blisters break and leave shallow raw spots; this is usually the most painful stage and the most contagious.
- Crusting and healing — the sores dry, scab over, and the skin closes back up over a week or more in a first episode.
- Systemic symptoms — with a first outbreak you may run a fever, ache all over, and feel swollen, tender lymph nodes in the groin.
Most people have no symptoms, or symptoms so mild they never notice them, so the majority of HSV-2 infections are never diagnosed. You can read more on that in our guide to herpes & asymptomatic carriers.
Where outbreaks show up (and the spots people miss)
Sores appear on or around the genitals, the rectum, or the mouth, but the exact spot varies more than people expect. On the genitals that can mean the labia, vaginal opening, penis, scrotum, or the skin of the upper thighs and buttocks. Anal and rectal sores are easy to miss because you can't see them, and they may just feel like pain, itching, or a tear. Oral-type HSV-1 increasingly shows up on the genitals through oral sex, and the classic cold sore on or around the lips is the same family of virus.
How soon symptoms appear after exposure
The current CDC clinical pages we reviewed don't state a fixed number of days from exposure to a first lesion, and in practice it's unpredictable. Some people develop sores soon after getting infected, while others carry the virus for months or years before a first outbreak, if they ever have one at all. That gap matters for testing timing: a blood test can take up to sixteen weeks or longer to turn positive CDC herpes testing. See when to test after exposure for how to time things.
What people mistake herpes for
Because the sores can be small and the symptoms mild, herpes is often confused with other things. Common mix-ups include:
- Razor burn, ingrown hairs, or folliculitis (irritated hair follicles) on shaved skin.
- A urinary tract infection — burning when you urinate, especially when a sore sits near the urethra.
- A yeast infection or general irritation, since itching and soreness overlap.
- A canker sore or a chapped lip when the outbreak is oral.
- A minor cut, friction sore, or pimple in the genital area.
To settle the question, test a fresh sore rather than guess. If you can get in while a sore is open, a swab gives a clear answer.
What happens if herpes goes untreated
Herpes is a manageable skin condition for most people, but it carries real risks worth understanding:
- Ongoing transmission — people with HSV-2 shed virus on about ten percent of days even with no sore present, and most of that shedding leaves nothing visible, so it spreads unknowingly JAMA shedding study.
- Higher HIV risk — HSV-2 raises the chance of acquiring HIV roughly two- to three-fold, and having both infections makes onward HIV spread more likely.
- Neonatal herpes — a potentially deadly infection in a newborn. Herpes acquired during pregnancy can also lead to miscarriage or preterm delivery, so pregnant people with a history of herpes should tell their prenatal team.
Reducing how often outbreaks strike is largely about managing what sets them off. Sleep, stress, illness, and skin friction can all play a part. We cover that in detail in herpes outbreak triggers & how to prevent them.
Who should get screened
The USPSTF recommends against routine blood screening for herpes in adults and adolescents who have no symptoms — including pregnant people — and gives it a Grade D USPSTF, 2023. In people without symptoms the blood tests produce a lot of false positives, and a wrong result can cause anxiety and relationship strain without any clear benefit. Screening is aimed at people with symptoms or a sore to test.
How herpes is tested
If you have a sore, the accurate test is a swab of that sore (a NAAT or viral culture). Go in while it's fresh, because the test works best on an active lesion. Routine blood testing without symptoms isn't recommended. For the full walk-through of options, when to use them, and how to book, see get tested.
When to see a clinician
See a clinician if you have a new genital, anal, or oral sore, ideally while it's still open so it can be swabbed. Go sooner if you're pregnant and have a history of herpes, if the pain is severe or you can't urinate, if outbreaks are frequent enough to disrupt your life (daily antivirals can make them rare), or if you've had a positive blood test but no symptoms and want help making sense of it. There's good guidance on the practical and emotional side in living with genital herpes.