Swollen lymph nodes from herpes typically last 2 to 4 weeks during a first outbreak, which is the longest and most intense episode most people experience. During recurrent outbreaks, lymph node swelling is less common and usually resolves faster, though in rare cases lymphatic complications can persist for three weeks or longer.
First Outbreak: The Worst for Swollen Nodes
A primary herpes infection triggers the strongest immune response because your body is encountering the virus for the first time. About 80% of people with a first genital herpes outbreak develop tender, swollen lymph nodes in the groin. For oral herpes, the swelling shows up in the neck and under the jaw. The entire first episode, including the lymph node swelling, generally lasts 2 to 4 weeks from start to finish.
The nodes swell because they’re filtering the virus and producing immune cells to fight it. During this initial infection, you may also have fever, body aches, and headaches alongside the blisters and sores. The lymph nodes tend to feel tender to the touch, sometimes noticeably so, and they gradually shrink as the sores heal and the immune system brings the virus under control.
Recurrent Outbreaks: Shorter and Milder
Once your body has built antibodies to herpes, future outbreaks are typically less severe. Systemic symptoms like fever and swollen lymph nodes occur in only about 5 to 12% of recurrent episodes. When lymph node swelling does happen during a recurrence, it tends to be milder and resolve within a week or two, tracking closely with how quickly the sores themselves heal.
Recurrent outbreaks are generally shorter overall. Most people find that sores clear within 5 to 10 days, and any accompanying lymph node tenderness follows a similar timeline. Over time, as outbreaks become less frequent, swollen lymph nodes become an increasingly rare part of the experience.
Which Lymph Nodes Swell Depends on Location
The lymph nodes closest to the site of infection are the ones that react. Genital herpes (whether caused by HSV-1 or HSV-2) causes swelling in the inguinal nodes, the small glands in your groin crease. Oral herpes affects the cervical lymph nodes, located along the sides of the neck and under the jawline. In some first-time infections, nodes in the armpits can also swell.
You might feel one or several swollen nodes on the same side as your sores, or on both sides. They usually feel like firm, marble-sized lumps that are tender when you press on them.
When Swelling Lasts Longer Than Expected
Most herpes-related lymph node swelling resolves as the outbreak heals. But in uncommon cases, lymphatic complications from herpes can take up to 21 days to fully resolve, and occasionally persist even longer. If you’re taking antiviral medication and your sores have healed but the nodes remain enlarged, that’s not necessarily a sign of something serious. Lymph nodes can take a bit longer to return to their normal size even after the infection itself has cleared.
That said, lymph nodes that keep growing or remain swollen for more than 4 weeks after your outbreak has resolved deserve medical attention. Persistent swelling beyond 8 to 12 weeks without any change in size raises different concerns unrelated to herpes. Nodes that are hard, fixed in place (not movable under the skin), or painless are also worth getting checked, as herpes-related swelling is almost always tender and mobile.
Swollen groin lymph nodes can also result from other sexually transmitted infections, skin infections on the legs or feet, or simple irritation. If you’re not sure whether herpes is behind the swelling, the pattern of symptoms matters: herpes-related nodes almost always appear alongside or shortly after blisters or sores, and they go down as the sores heal.
What Helps While You Wait
There’s no way to directly speed up how fast your lymph nodes shrink, but treating the underlying outbreak helps. Antiviral medication taken early in an outbreak shortens the duration of sores, which in turn shortens how long your lymph nodes stay reactive. Over-the-counter pain relievers can help with the tenderness. A warm compress on the swollen area may also provide some comfort, though it won’t change the timeline.
If you’re experiencing your first outbreak and the swollen nodes are particularly painful or accompanied by difficulty urinating, fever above 101°F, or severe headache, those are signs the initial infection is hitting hard and antiviral treatment can make a meaningful difference in how quickly everything resolves.