The short answer
A vulvar fissure is a small split or crack in the skin. It is a visible finding, not a diagnosis. Fissures can occur when tissue stretches, rubs, becomes inflamed, is fragile, or is affected by infection or a skin disorder. 1 Seeing a crack does not prove yeast, does not prove sexual trauma, and does not tell you the underlying cause from a photograph alone.
The differential is broader than friction
DermNet describes posterior fourchette fissuring as either primary—without an identified underlying skin disease—or secondary to another condition. Listed possibilities include candidiasis, herpes, atrophic tissue, contact dermatitis, atopic dermatitis, lichen simplex, lichen sclerosus, delayed healing after childbirth, and other causes. 1
Friction or penetration may reveal a fragile area, but the event that opens the fissure is not necessarily what made the tissue vulnerable.
Symptoms can be sharp even when the split is tiny
Fissures may cause pain with penetration, a tearing sensation, bleeding or spotting, itching, burning, or stinging when urine, water, or semen contacts the area. 1 A small linear erosion can therefore feel much more dramatic than it looks.
The reverse also matters: if an examination occurs after the fissure has healed, the vulva may look normal. 1 That can make a careful history of location, recurrence, triggers, bleeding, and associated skin changes useful.
A fissure does not identify the cause
Lichen sclerosus can cause vulvar tears, according to ACOG, while other skin disorders can also cause cracks or ulcers. 2 3 If white fragile skin or architectural change is present, see vulvar lichen sclerosus and itching. If there is an eczematous or exposure-linked pattern, see vulvar dermatitis and itching.
Swabs may be used when infection is suspected, and biopsy can sometimes help identify an underlying dermatosis; primary fissuring can still produce nonspecific pathology. 1 That is another reason not to convert one test into a universal answer.
Trauma attribution requires care
DermNet includes straddle injury, violence, or rape among possible causes of laceration, but a fissure by itself does not establish how an injury occurred. 1 Causal attribution should not be made from a web description or image, especially where coercion or assault may be involved.
For ulcers, sores, or other red-flag genital lesions, see genital itching with sores.
When the route changes
Deep or wide ulceration, marked swelling, lumps, significant or persistent bleeding, wound concerns, suspected infection, or repeated fissures without a clear explanation require a broader examination route. 1 A fissure does not automatically trigger yeast treatment. This page does not recommend home cutting, lancing, caustic products, or automatic antifungal treatment.
Bottom line
Vulvar fissures are a skin finding that needs context. Friction may open the skin, but dermatitis, infection, lichen sclerosus, hormonal tissue fragility, childbirth-related healing, trauma, or no identified disease can sit underneath. Do not diagnose the cause from the crack itself, and do not turn every fissure into yeast or trauma.
Medical-information boundary
This article provides general health information and does not diagnose an individual or select a patient-specific treatment. See the medical information disclaimer.
Sources
- DermNet: Recurrent fissuring of posterior fourchette. Evidence reviewed 2026-09-14. Fissure causes, symptoms, examination, swab/biopsy context, and primary versus secondary fissuring.
- ACOG: Disorders of the Vulva. Evidence reviewed 2026-09-14. Lichen sclerosus can cause tears; visible vulvar changes and symptoms need examination.
- ACOG: When Sex Is Painful. Evidence reviewed 2026-09-14. Vulvar skin disorders can produce cracks or ulcers and require cause-specific evaluation.