A new genital rash usually isn't herpes or any STD — contact dermatitis from latex condoms, soap, lube, or laundry detergent is a far more common cause. Contact dermatitis is an itchy, red, often symm
A 4th-generation HIV test (an antigen/antibody lab test) and a rapid antibody test both look for HIV, but they detect it at different points. The 4th-gen test catches the p24 antigen — a viral protein
Anal warts and hemorrhoids both show up as bumps near the anus, but they're entirely different problems. Anal warts are caused by HPV, a sexually transmitted virus, and usually feel like small, firm,
Chlamydia and Mycoplasma genitalium are both bacteria that infect the urethra and cervix and cause overlapping symptoms — discharge, burning, and pelvic pain — but they're different organisms with dif
Doxy-PEP and PrEP aren't the same thing. Doxy-PEP is an antibiotic (doxycycline) taken after sex to lower the risk of certain bacterial STIs like syphilis and chlamydia. PrEP is medication taken to pr
Genital warts are caused by HPV and look like small flesh-colored bumps or a cauliflower-like cluster that can appear singly or in groups. Skin tags are soft, dangling, non-viral flaps of normal skin.
A penile rash that itches, burns, or blisters is most often one of three things: a yeast infection (Candida overgrowth on the glans), genital herpes (an HSV viral infection), or balanitis (general inf
The difference between RPR and FTA-ABS is what each one measures and when it's used. RPR is a nontreponemal screening test that looks for the body's general reaction to syphilis-related damage; FTA-AB
The window period is the gap between an exposure and when a test can actually detect that infection. It varies by STD: HIV can show up on a nucleic acid test in roughly 10-33 days, while chlamydia and
Syphilis moves through four stages. The primary stage is a painless sore (chancre) at the infection site. The secondary stage brings a body rash and flu-like illness. The latent stage has no symptoms
Gonorrhea and syphilis are both curable bacterial STIs, but they behave differently: gonorrhea is the classic "discharge" infection — burning urination and penile or vaginal discharge — while syphilis
Syphilis, herpes, and chancroid all cause genital sores, but the classic split is pain and depth: a syphilis chancre is a single firm, painless ulcer; herpes makes clusters of small painful blisters t
A yeast infection brings diffuse itching, burning, and a thick white discharge across the whole vulva, while genital herpes typically causes a cluster of painful blisters or sores in one spot. Yeast i
Folliculitis, herpes, and genital warts can all show up as bumps below the belt, but they're caused by completely different things: folliculitis is an inflamed or infected hair follicle, genital herpe
Gonorrhea treatment is now a single injection of the antibiotic ceftriaxone — not the oral pills or drug combinations once used. The bacterium has grown resistant to nearly every older option, so curr
Hepatitis A and hepatitis B are both viral liver infections, but they differ in how they spread, how long they last, and whether they're curable. Hepatitis A spreads mainly through contaminated food o
Condoms and PrEP solve different problems. Condoms are a physical barrier that blocks many STDs — chlamydia, gonorrhea, syphilis, HIV — plus pregnancy. PrEP is a daily pill or shot that stops HIV only
A vaginal yeast infection and a urinary tract infection feel different at their core: yeast brings external itching, soreness, and a thick white discharge, while a UTI brings internal burning with urg
Gardasil and Gardasil 9 are both HPV vaccines, but they cover different numbers of strains. The original Gardasil protected against four HPV types (6, 11, 16, 18). Gardasil 9 adds five more cancer-cau
Genital herpes usually shows up as a tight cluster of small blisters that burn or sting, break open into raw sores, then crust over and heal in a week or more — and tend to come back in the same spot.
Razor burn shows up within a day of shaving as a patch of diffuse redness and tiny irritation bumps that fade in a day or two. Genital herpes tends to start as a tight cluster of small blisters that b
Both rapid and lab HIV tests are accurate, but they detect infection at different points. A 4th-generation lab antigen/antibody test finds HIV earlier — roughly 18 to 45 days after exposure — because
For uncomplicated genital chlamydia, current CDC guidance prefers doxycycline (100 mg twice daily for 7 days) over single-dose azithromycin (1 g). Both cure most infections, but doxycycline clears rec
Truvada and Descovy are both once-daily PrEP pills that prevent HIV before exposure, and both are highly effective. The big practical difference: Truvada covers risk from sex or injection drug use, wh
Two of the most common causes of an unusual vaginal discharge are a yeast infection and bacterial vaginosis (BV). The quick tell: yeast tends to bring thick, white, odorless discharge with itching, wh
If you're staring at a new bump trying to decide herpes vs pimple, here's the quick read: a pimple is usually a single, pop-able whitehead that clears in a few days, while genital herpes tends to show
Cold sores and genital herpes are the same family of virus — herpes simplex — just in different places. Cold sores are usually HSV-1 on the mouth; genital herpes is HSV-2 or, increasingly, HSV-1 on th
PCR (a nucleic acid test) finds the pathogen's genetic material directly, so it detects an active infection — used for chlamydia, gonorrhea, and trichomoniasis. An antibody test finds your immune syst
Most mouth and lip sores fall into one of two buckets: an aphthous ulcer (canker sore), which is a shallow, non-contagious a crater inside the mouth, and a herpes cold sore, which is a contagious clus
PrEP is daily (or scheduled) medicine HIV-negative people take before possible exposure to prevent infection; PEP is an emergency course started after a single possible exposure. PrEP is ongoing preve
Trichomoniasis and chlamydia are both common, both often silent, and both fully curable — but they're entirely different organisms. Trich is a parasite treated with metronidazole; chlamydia is a bacte
Syphilis, herpes, and HPV can all show up as something on your skin down there, but they're caused by different organisms and behave very differently. A syphilis chancre is usually a single painless f
HSV-1 and HSV-2 are the two herpes simplex viruses behind oral and genital herpes. The biggest practical difference is recurrence: genital HSV-2 comes back and sheds virus far more often than genital
HIV is the virus; AIDS is the most advanced stage of an untreated HIV infection. Everyone with AIDS has HIV, but most people with HIV never develop AIDS. HIV becomes AIDS only when the immune system i
The fastest way to tell herpes from syphilis is the sore itself: herpes typically causes clustered, painful blisters that break into raw sores and recur, while early syphilis causes a single firm, pai
If a groin rash itches more than it hurts and spreads outward in a ring with a clearer center, it's most likely jock itch (a fungal infection). If you see a tight cluster of small, painful blisters th
Hepatitis B and hepatitis C are both blood-borne liver infections that can spread through sex, but they differ in two ways that matter most: hepatitis B is vaccine-preventable and usually controlled (
Genital warts, herpes, and molluscum bumps look enough alike that you usually can't tell them apart by sight. Warts tend to be rough or cauliflower-like, herpes shows up as painful blisters that crust
Crabs and scabies both itch in the genital area, but they're different parasites with different treatments. Crabs (pubic lice) are visible insects that cling to coarse hair. Scabies is a microscopic m
BV, a yeast infection, and trichomoniasis all cause discharge, itching, and irritation, but they differ in cause and cure. BV and trich produce a thin discharge with a fishy odor; yeast brings thick,
The difference comes down to cause. Bacterial and parasitic STIs — chlamydia, gonorrhea, syphilis, and trichomoniasis — are curable with antibiotics . Viral STIs — herpes, HIV, hepatitis B, and HPV —