STDs & STIs STD Symptoms

Genital Bumps & Sores: STI or Something Else?

From herpes and syphilis to a harmless ingrown hair, genital bumps and sores have many look-alikes. Learn the tells that separate an STI from a benign spot - and when to get seen.

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How the common causes differ
FAQs

Found a bump or sore and not sure what it is? Plenty of genital lesions are completely harmless — and a few are STIs worth catching early. The tool below takes what it looks like, whether it hurts, and how many there are, then shows which causes fit and how urgently to act. It can't diagnose you; look-alikes are common and only a clinician can be sure.

How the common causes differ

The single most useful tell is often whether a sore hurts: a painful cluster of blisters points toward herpes, while a single painless ulcer is the classic sign of syphilis — and precisely because it doesn't hurt, it's the one people most often ignore. Here's how the usual suspects compare at a glance.

Cause	Looks like	STI?
Herpes (HSV)	Cluster of small, painful blisters → shallow sores; often tingling first; recurs.	STI
Syphilis (chancre)	Single firm, painless open sore ~3 wks after exposure; heals but infection stays.	STI
Genital warts (HPV)	Flesh-colored/gray, soft, painless; flat or cauliflower-like; grow over weeks.	STI
Molluscum	Firm pearly domes with a tiny central dimple; painless; spread by skin contact.	STI
Ingrown hair / folliculitis	Tender red or pus bump, often a hair trapped under it; clears in days.	No
Pimple / blocked gland	Red bump with a white pus tip, like acne; harmless, self-limited.	No
Pearly papules / Fordyce spots	Rows of smooth domes around the head, or scattered pale dots; normal anatomy.	No

The distinguishing features above follow the CDC's guidance on genital ulcers and STI symptoms and standard dermatology references. Any new, painful, open, or persistent genital bump or sore should be seen by a clinician — and never popped, squeezed, or self-treated.

Keep exploring on EasySTD: compare testing services, STD incubation periods and Genital warts testing.

Medically Reviewed & Fact-Checked · Updated July 1, 2026

Reviewed by EasySTD Editorial Team

Compiled and checked by EasySTD's editorial team against CDC and public-health sources. This is educational information, not a substitute for advice from a licensed clinician. Our editorial guidelines →

2 Sources

Data & references

CDC, About Sexually Transmitted Infectionshttps://www.cdc.gov/sti/about/index.html
CDC, STI Treatment Guidelines (genital ulcers)https://www.cdc.gov/sti/treatment-guidelines/index.html

Good to Know

Frequently asked questions

Quick answers to the questions people ask most.

Is it herpes or just a pimple or ingrown hair?

They can look alike at first, but there are tells. A pimple or ingrown hair is usually a single tender bump with a white pus head or a hair trapped under it, and it clears in a few days. Herpes tends to be a cluster of small, painful blisters that often start with tingling, break open into shallow sores, and recur over time. If a bump is painful, blisters, appears in a cluster, or doesn't heal within a week or so, get it checked, only a clinician (sometimes with a swab) can tell for sure.

Can a genital sore be painless and still be serious?

Yes, this is the most important one to know. A syphilis sore (chancre) is classically a single, firm, painless open sore that shows up around three weeks after exposure and heals on its own in a few weeks. Because it's painless and goes away, it's easy to ignore, but the infection stays in your body and progresses if untreated. Any painless genital ulcer should be evaluated and tested for syphilis promptly.

What do genital warts look like versus molluscum?

Both are usually painless. Genital warts (HPV) are flesh-colored or gray, soft, and can be flat or cauliflower-like, sometimes clustering and growing over weeks. Molluscum contagiosum bumps are firm, pearly or flesh-colored domes with a tiny dimple in the center. A clinician can usually tell them apart by sight, and both are manageable.

I have rows of small bumps that have always been there, is that an STD?

Probably not. Neat rows of tiny, smooth, dome-shaped bumps around the head of the penis are pearly penile papules, and scattered pale or yellowish dots on the shaft or vulva are Fordyce spots. Both are completely normal, non-infectious anatomy present in a large share of people: not an STI, not contagious, and nothing to treat. If they're new, changing, or you're unsure, a clinician can confirm in seconds.

Should I pop or treat it myself?

No. Squeezing or picking at a genital bump can spread infection, cause scarring, or make a diagnosis harder. Don't apply over-the-counter wart treatments to the genitals either, they're not made for that skin. The safe move for any new, painful, open, or persistent genital bump or sore is to have a clinician look at it.

Is this tool a diagnosis?

No. Genital bumps and sores have a lot of look-alikes, and even experienced clinicians often confirm with a swab or blood test. This tool shows you which causes fit the pattern you describe and how they differ, it can't tell you which one you have. Use it to understand what you're seeing and how urgently to act, then see a provider.

Have a different question? Browse the full STD & STI FAQ library, every question we answer, in one place.