Article by Dr. Patricia Gutiérrez Ontalvilla, MD, PhD. Plastic surgeon, Doctor of Medicine, specialist in vulvar lichen sclerosus, and creator of the Liquenia® Protocol.
There is a story I hear almost every week in my clinic, and it always starts the same way: a woman arrives with four or five years of antifungal treatments behind her, including suppositories, creams, and tablets. She would improve for a few days, and then the itching would inevitably return, so she would change brands and repeat the cycle. In all that time, no one had examined her vulva under good light and without rushing, which is the only thing that truly separates candidiasis from lichen sclerosus.
Candidiasis produces a thick, white discharge, itching, and stinging, and it subsides with the correct antifungal within a few days. Lichen sclerosus produces persistent itching without discharge, worsens at night, and does not respond to any antifungal. To know if your condition is candidiasis or lichen sclerosus, the most useful sign is not the symptom but the response to treatment. When the antifungal fails twice in a row, what needs to be reviewed is the diagnosis, not the dose.
Candidiasis or Lichen Sclerosus: Why They Are So Often Confused
Both conditions share the symptom that is most distressing but least helpful for diagnosis: itching. This overlap explains why many women spend years treating yeast infections they never had. The confusion is not uncommon, and it is certainly not the fault of the patient who self-medicates with what worked once before.
Krapf et al. surveyed 503 premenopausal women with biopsy-confirmed lichen sclerosus, and 66% had previously received a different diagnosis (Journal of Lower Genital Tract Disease, 2022). The most frequent misdiagnosis, by far, was a vaginal yeast infection, which appeared in 49% of those cases. The average delay until the correct diagnosis was four years. It is worth qualifying this data: it is a voluntary online survey, which tends to collect the most symptomatic cases, and only includes premenopausal women.
Ferris et al. evaluated 95 women with symptoms who had just purchased an over-the-counter antifungal, and only 33.7% actually had candidiasis (Obstetrics & Gynecology, 2002). The rest had bacterial vaginosis, mixed conditions, or other entirely different causes. This data should be read carefully, as it is an observational study and not a trial: it describes an association between self-medication and diagnostic error, and does not quantify how many of those women had underlying lichen sclerosus.
Lichen sclerosus is also not as uncommon as its name sounds. Goldstein et al. reviewed 1,675 consecutive records from a general gynecology practice and found 1.7% of cases confirmed by biopsy (Journal of Reproductive Medicine, 2005). This is from a single private practice, so that figure does not equate to population prevalence, but one in sixty women is a high number for a disease that almost no one knows how to name.
The training of the professional treating you carries as much weight as your own symptoms. Crew et al. surveyed 122 primary care professionals in the UK, and 37.7% had never participated in any training on vulvar skin disease (British Journal of General Practice, 2025). This is a survey with opportunistic sampling and does not describe Spanish primary care, although it explains quite well a pattern I see repeated every week in my clinic. Clarke et al. later gathered 56 studies on these same barriers in a systematic review (Clinical and Experimental Dermatology, 2026).
This delay has a consequence I see daily: the skin has been inflamed for years by the time the first effective cream arrives. If what bothers you most is the itching itself rather than the diagnostic doubt, I address that separately in constant vulvar itching, where I explain why the skin continues to signal even when you don’t touch it. This article deals with the step before that: knowing what you are treating.
Five Differences Between Candidiasis and Lichen Sclerosus You Can Observe Yourself
None of these signs diagnose anything on their own, and they do not replace an examination. They serve a more modest and useful purpose: to decide if it is worth insisting that someone looks at you closely. Orienting yourself between candidiasis or lichen sclerosus starts by observing these five details.
- Discharge. Candidiasis almost always produces a thick, white discharge, while lichen sclerosus produces no discharge of any kind.
- Timing. The itching of lichen usually worsens at night and can even wake you up, while that of candidiasis remains more constant throughout the day.
- Response to treatment. True candidiasis subsides in a few days with the correct antifungal, while lichen sclerosus does not budge.
- Color. Lichen lightens the skin and leaves pearly white plaques, especially around the clitoris and on the vulvar fourchette.
- Shape. Lichen gradually erases the anatomy, such that the labia minora are reabsorbed and the clitoral hood eventually closes over itself.
That last point is what concerns me most, because it is the only one that does not recover on its own over time. I elaborate on this with images and specific descriptions on the page for clinical signs of vulvar lichen sclerosus.
What I Do When Someone Arrives with Recurrent Yeast Infections
The first thing I do is look, and I say that without any irony. Examining the vulva under good light and describing in writing what I see in each area is the step most often missing in the histories that reach me. It sounds elementary and remains the real bottleneck for this diagnosis.
Then I organize the process instead of accumulating treatments. A culture clarifies in a few days whether there is a fungus or not, and that single piece of data already separates candidiasis from lichen sclerosus in most cases. If the skin shows white plaques, loss of architecture, or a lesion that does not fit, I indicate a biopsy, and I explain when it is appropriate and when it is not in vulvar biopsy in lichen sclerosus. The full criteria are gathered on the diagnosis of vulvar lichen sclerosus page.
The fact that the antifungal does not work does not mean you have lichen sclerosus, and this should be stated clearly to avoid replacing one worry with another. The choice is not always between candidiasis or lichen sclerosus. There are other common causes of vulvar itching that also do not respond to antifungals: contact dermatitis from soaps, menopause-related atrophy, vaginosis, or simply irritated skin. You can review them on the differential diagnosis page, and keep the underlying idea in mind: what changes the prognosis is not changing creams, but having someone perform an examination.
The Two Most Damaging Errors
The first error is treating without a diagnosis, which is what appears in the story I opened this article with. Years of antifungals, and sometimes lasers, platelet-rich plasma, or hyaluronic acid applied based on a clinical impression that no one ever confirmed. Money is lost and trust is lost, but above all, tissue health is lost, which is the only thing that cannot be recovered later.
The second error is exactly the opposite and carries even more weight in the available evidence. When the clinical presentation is clear, waiting months for a test before starting corticosteroids also causes harm, because the inflammation continues to work in the meantime. Potent topical corticosteroids remain the foundation of treatment; they are maintained in a regimen and are not withdrawn out of fear, as I explain on the clobetasol for vulvar lichen sclerosus page.
Neither excess nor deficiency, therefore: first an organized diagnosis that clarifies whether it is candidiasis or lichen sclerosus, and then a treatment that starts early and is sustained over time.
When a treatment fails twice, the problem is rarely the dose. It is the diagnosis.
Dr. Patricia Gutiérrez Ontalvilla
Signs That Should Not Wait for the Next Check-up
There are findings that do not allow for a prudent wait of a few months and require booking an appointment as soon as possible:
- An ulcer or a wound on the vulva that does not heal in two weeks.
- A lump, a new nodule, or an area that feels thickened to the touch.
- Vulvar bleeding without an explanatory cause.
- A reddish, brown, or warty spot on a previously known white plaque.
- Pain that increases rapidly within a few weeks.
None of these signs mean you have something serious, and most of the time it is not. They mean something else: that they must be looked at now and not at the check-up in six months.
Frequently asked questions
Can I have candidiasis and lichen sclerosus at the same time?
Yes, and it happens with some frequency, because skin with lichen is fissured and becomes superinfected more easily, especially if you use corticosteroids continuously. Therefore, it is advisable to treat the fungus when the culture confirms it and continue treating the lichen afterwards, as one does not exclude the other at any time.
How do I distinguish candidiasis or lichen sclerosus without going to the doctor?
You cannot distinguish them reliably on your own and you should not try, because the two diseases overlap in their main symptom. What you can do is recognize the pattern that requires consultation: persistent nocturnal itching, without discharge, that does not respond to antifungals. With that, you have sufficient reason to request a vulvar examination.
How many times can I treat a yeast infection before worrying?
My criteria in the clinic are simple and I share them with you as they are: two antifungal treatments without resolution and without any testing are enough to stop and rethink the diagnosis from the beginning. Continuing by inertia with a third and fourth is exactly what turns a few months into several years without knowing if it is candidiasis or lichen sclerosus.
Is a biopsy always necessary to diagnose lichen sclerosus?
Not always, and this should be clarified because it generates a lot of confusion. International guidelines allow for clinical diagnosis when the presentation is typical, and reserve biopsy for atypical cases, suspicion of a tumor lesion, or lack of response to treatment. In my protocol, I am more demanding and indicate it sooner, because I want to know how much inflammation and how much sclerosis there is before deciding anything.
References
- Krapf JM, Smith AB, Cigna ST, Goldstein AT. Presenting symptoms and diagnosis of vulvar lichen sclerosus in premenopausal women: a cross-sectional study. Journal of Lower Genital Tract Disease. 2022;26(3):271-275. DOI: 10.1097/LGT.0000000000000679
- Ferris DG, Nyirjesy P, Sobel JD, Soper D, Pavletic A, Litaker MS. Over-the-counter antifungal drug misuse associated with patient-diagnosed vulvovaginal candidiasis. Obstetrics & Gynecology. 2002;99(3):419-425. DOI: 10.1016/s0029-7844(01)01759-8
- Goldstein AT, Marinoff SC, Christopher K, Srodon M. Prevalence of vulvar lichen sclerosus in a general gynecology practice. Journal of Reproductive Medicine. 2005;50(7):477-480. PMID: 16130842
- Crew A, Leatherland R, Clarke L, Owen C, Simpson RC. Barriers to diagnosing and treating vulval lichen sclerosus: a survey study. British Journal of General Practice. 2025;75(753):e250-e256. DOI: 10.3399/BJGP.2024.0360
- Clarke L, Leatherland R, Simpson RC. A systematic review of the barriers to diagnosis of vulval lichen sclerosus in primary care. Clinical and Experimental Dermatology. 2026;51(6):929-938. DOI: 10.1093/ced/llaf481
Have you been treating yeast infections for years that won’t heal?
An organized vulvar examination resolves in a single visit the doubt between candidiasis or lichen sclerosus that self-medication does not resolve in years. We can evaluate your case and tell you what you are truly treating.
Dr. Patricia Gutiérrez Ontalvilla, MD, PhD. Plastic, reconstructive, and aesthetic surgeon, Doctor of Medicine, and researcher in regenerative medicine applied to vulvar lichen sclerosus. Creator of the Liquenia® Protocol. More information at dragutierrez.com.
This article is for informational purposes and does not replace a medical consultation. If you have persistent vulvar symptoms, see your specialist for an individual assessment.
