Noticing an unexplained blister, sore or tingling sensation can be worrying, especially when you are unsure whether it could be herpes. However, symptoms are not always obvious. Some people develop painful blisters, while others have symptoms so mild that they mistake them for ordinary skin irritation.
There are two main types. HSV-1 commonly causes oral herpes or cold sores, but it can also affect the genital area. HSV-2 mainly causes genital herpes and is usually transmitted through sexual contact.
Either type can cause oral or genital symptoms. Many people have no noticeable symptoms or do not recognise the symptoms when they occur.
What Are the First Signs?
Before visible sores develop, some people experience a warning stage known as the prodrome. Early symptoms may include tingling, itching, burning, tenderness, discomfort or pain around the area where the sores will later appear.
These sensations may begin before any blister is visible. Recognising these early warning signs can be helpful because herpes treatment is generally most effective when started soon after symptoms begin.
Symptoms of Oral Herpes
Oral herpes usually affects the lips, mouth or surrounding facial area. It is commonly referred to as a cold sore.
A typical oral herpes outbreak may begin with tingling, itching or burning. Within the following days, one or more small, fluid-filled blisters may appear. The blisters can then break open, release fluid and develop a crust or scab while healing.
Oral herpes may cause small blisters on or around the lips, open or painful sores around the mouth and burning or tingling before a sore appears. The affected area may feel painful or sensitive when touched. During some first infections, sores may also develop inside the mouth.
Some people experience a sore throat, swollen lymph nodes, fever, headache or body aches during their first oral herpes outbreak. A first infection may cause more general symptoms than later outbreaks, while recurrent cold sores are normally shorter and less severe.
Not every blister or sore around the mouth is herpes. Mouth ulcers, spots, boils and some bacterial skin infections can cause similar-looking changes, so a medical assessment may be useful when the cause is unclear.
Symptoms of Genital Herpes
Genital herpes can affect the skin around the genitals, anus, buttocks or upper thighs. Symptoms may appear externally, but sores can also occur in places that are difficult to see.
Genital herpes symptoms may include one or more small bumps or fluid-filled blisters. These blisters may open and become painful sores. Some people experience tingling, burning or itching around the genitals before the sores appear.
Other symptoms can include pain or burning when passing urine, tenderness around the affected skin and unusual genital discharge. Sores may also appear around the anus, buttocks or upper thighs.
The sores may not always appear bright red, particularly on brown or black skin. Some may look like small cuts, irritated areas or subtle bumps rather than an obvious cluster of blisters.
First Genital Herpes Outbreak Symptoms
The first recognised genital herpes outbreak can be more uncomfortable than later recurrences. In addition to genital sores, a new infection may cause symptoms that feel similar to a viral illness.
A person may experience fever, headache, body aches, tiredness and swollen lymph nodes near the groin. The outbreak may also involve several painful blisters or ulcers, as well as pain or burning when urinating.
However, a first recognised outbreak does not necessarily show when the infection was acquired. Symptoms may not be noticed until much later, and a herpes test cannot determine exactly how long someone has carried the virus or who transmitted it to them.
What Do Recurrent Herpes Symptoms Feel Like?
After the initial infection, herpes remains in the body and may reactivate. This can cause repeated outbreaks, also called recurrences.
A recurrent outbreak may begin with tingling in a familiar area, localised itching, burning or mild pain. A small number of blisters or sores may then develop in or near the same area as a previous outbreak.
Repeated outbreaks are generally shorter and less severe than the first episode. Some people eventually experience fewer outbreaks, while others may have no further noticeable symptoms. Genital HSV-2 usually causes recurrences more frequently than genital HSV-1.
Can You Have Herpes Without Blisters?
Yes. Many people with oral or genital herpes have no symptoms or only very mild symptoms. The classic painful blisters and ulcers may not be present when a person visits a clinic, which makes herpes difficult to diagnose by appearance alone.
Even when no sores are visible, the virus can sometimes be present on the skin and transmitted to another person. Therefore, the absence of symptoms does not always mean that herpes is absent or cannot be passed on.
Are Herpes Symptoms Enough for a Diagnosis?
Symptoms alone cannot reliably confirm herpes. Other infections and skin conditions can cause sores, itching, irritation or pain.
When a fresh blister or sore is present, a clinician may collect a sample from the affected area using a swab. Laboratory testing such as an HSV PCR or another nucleic acid amplification test can identify the virus and determine whether it is HSV-1 or HSV-2.
Testing is usually most useful while the lesion is still fresh because older or healing sores may contain less detectable virus.
Blood antibody testing may sometimes be considered when no active lesion is available, although it has limitations. For example, an HSV-1 blood result cannot usually show whether the infection is oral or genital. HSV IgM testing is not recommended because it cannot reliably distinguish a new infection from a recurrent one.
When Should You See a Doctor?
You should arrange an assessment if you notice new blisters, ulcers or unexplained genital symptoms. Medical advice is particularly important if this is your first possible herpes outbreak, the sores are very painful or widespread, or passing urine becomes painful or difficult.
You should also speak with a healthcare professional if your symptoms are not beginning to improve, you are pregnant or may be pregnant, you have a weakened immune system, or you are unsure whether the symptoms are caused by herpes or another condition.
Starting antiviral treatment early may shorten an outbreak and reduce its severity. Antiviral medicines can control symptoms, but they do not remove the virus from the body.
What Should You Do While Waiting for a Test?
Avoid kissing, oral sex and direct contact with affected skin when oral symptoms are present. With possible genital herpes, avoid vaginal, anal and oral sex from the first signs of tingling or itching until all sores have fully healed.
Wash your hands after touching the affected area and avoid picking, squeezing or deliberately opening the blisters, as this may irritate the skin and increase the risk of spreading the virus to another area.
The Bottom Line
Herpes symptoms can include tingling, itching, painful blisters, open sores and burning when urinating. A first outbreak may also cause fever, swollen lymph nodes, headache and body aches. However, many infections cause mild symptoms or no symptoms at all.
Because it is difficult to identify herpes from appearance alone, testing a fresh sore is usually the clearest way to confirm the cause. Anyone experiencing possible oral or genital herpes symptoms should speak with a healthcare professional for an accurate diagnosis and appropriate treatment.