Herpes or Pimple? How to Tell the Difference

Finding a new bump on your lip, face or genitals is stressful, and it’s natural to jump to the worst case. Most bumps turn out to be a pimple, an ingrown hair or skin irritation. But early herpes can look very similar, so it helps to know what to watch for.

How do I tell if it’s herpes or a pimple?

Look at three things: how it started, what it looks like, and how it changes over the next few days.

• How it started. Herpes often announces itself with tingling, itching or burning in the spot a day or two before anything appears. A pimple usually just shows up, sometimes tender to the touch.
• What it looks like. A pimple is usually one raised spot, firm at first, that forms a white or yellow head of pus. Herpes usually forms a small cluster of tiny blisters filled with clear fluid, sitting on red skin.
• How it changes. A pimple comes to a head and clears within a few days. Herpes blisters break open into shallow, painful sores, then crust over and heal, usually within one to three weeks.

These are patterns, not rules. Pimples can be sore and appear in groups, and herpes can show up as a single bump.

Can herpes look like a pimple?

Yes. A mild outbreak, or the very first day of one, can look like a single red pimple. That’s one reason so many people are unsure. Herpes becomes more likely if the spot tingled first, turns into clear blisters rather than a white head, or breaks open into a sore.

What about bumps on the face or lips?

Bumps on or around the lips are often cold sores, which are caused by herpes simplex virus, usually type 1 (HSV-1). Cold sores tend to appear at the edge of the lip, in the same spot each time. A pimple near the mouth is usually a single firm spot that doesn’t blister.

HSV-1 is very common. The World Health Organization estimates that most adults under 50 worldwide carry it, and many never have symptoms.

What about bumps on the genitals?

The genital area has more lookalikes. Ingrown hairs, razor bumps and inflamed hair follicles (folliculitis) are all common, especially after shaving or waxing. An ingrown hair usually sits around a single hair, and you may see the hair under the skin. Herpes sores are not tied to a hair follicle, and they tend to be more painful.

Genital herpes can be caused by either HSV-2 or HSV-1.

What should I do while I wait?

• Don’t squeeze or pop it.
• Keep the area clean and dry, and wash your hands after touching it.
• Avoid kissing or sexual contact with the area until you know what it is. Herpes spreads most easily when sores are present.
• Watch how it changes over two to three days. A photo each day can help if you see a clinician later.

Which test tells me for sure?

If you think it might be herpes, the best test is a swab of the sore (a PCR test), taken while it is fresh. A doctor or clinician can do this. Once a sore has healed, a swab can’t be taken.

A blood test for herpes antibodies shows whether you have been infected at some point, not whether this particular bump is herpes. Antibodies can take weeks to show up, so the CDC advises repeating the test 12 weeks after a suspected exposure if an early test was negative. The CDC doesn’t recommend routine herpes blood tests for people without symptoms, so think about whether one would help you. If you decide to test, you can order a blood test online.

If it turns out to be herpes, antiviral medicine prescribed by a clinician can shorten outbreaks and make them less frequent. Herpes is very common and manageable, and a diagnosis doesn’t change who you are.