Inflammatory Causes: Lichen Planus and Lichen Sclerosus

While many white patches in the vagina are related to the HPV virus, some are caused by chronic inflammatory conditions. These are not infections and they are not contagious; rather, they are “autoimmune-mediated,” meaning the body’s immune system mistakenly attacks the skin or mucosal lining ^[1].

When these conditions affect the vagina, they require a very different management approach than the “precancerous” changes covered on earlier pages. Instead of surgical removal, the goal is often medical management to calm the inflammation and prevent scarring ^[2].

Understanding the Anatomy

To navigate these conditions, it is crucial to understand the difference between the vulva (the external genital skin) and the vagina (the internal mucosal canal).

Lichen Planus: The More Common Vaginal Inflammatory Cause

Lichen Planus (LP) is the most frequent inflammatory cause of white patches or red, raw areas inside the vagina ^[3]. It can appear in several ways, but the “erosive” form is particularly common in the genital area ^[1].

• Symptoms: Unlike the itching often associated with other skin issues, LP in the vagina is frequently described as a burning or “glazed” pain ^[3]. It may also cause a yellow discharge or pain during intercourse ^[3].
• Appearance: It can look like white, lacy lines (called Wickham striae) or as bright red, “glazed” patches that bleed easily ^[1].
• The Risk of Scarring: One of the most important reasons to treat LP early is to prevent stenosis (narrowing) or adhesions (where the walls of the vagina stick together) ^[4]. If left untreated, the inflammation can lead to significant scarring that makes exams or intimacy difficult ^[5].

Lichen Sclerosus: Common on the Outside, Rare on the Inside

Lichen Sclerosus (LS) is a very well-known cause of white patches and “cigarette-paper” skin on the outer vulva and around the anus ^[6]. However, it is important to clarify that true Lichen Sclerosus inside the vaginal canal is extremely rare ^[7][8].

While LS is a common cause of “leukoplakia” on the outer genital skin, it typically stops at the “mucocutaneous junction”—the point where the outer skin meets the inner mucosal lining ^[8]. If a doctor sees a white patch deep inside the vagina, they will likely look for other causes first, though a few rare, biopsy-confirmed cases of vaginal LS have been documented in medical literature ^[7].

Distinguishing Inflammation from Precancer

Because inflammatory conditions can sometimes look like VaIN (precancer), a biopsy is essential for a clear diagnosis ^[1]. A pathologist will look for specific markers:

• For Lichen Planus: They look for a “band-like” layer of immune cells (lymphocytes) attacking the bottom layer of the skin ^[9].
• For Lichen Sclerosus: They look for a specific type of “thickened collagen” or scarring just below the surface ^[10].

It is also possible for these conditions to coexist with other issues. For instance, long-term inflammation from Lichen Sclerosus on the vulva can occasionally lead to a specific type of HPV-independent precancer called differentiated vulvar intraepithelial neoplasia (dVIN) ^[11]. This makes regular monitoring of the area vital ^[2].

Medical Management: Calming the Immune System

Unlike the high-grade precancers that often need to be removed with a laser or surgery, inflammatory conditions are treated with medications that dial down the immune response ^[12]. Do not self-treat with leftover steroid or antifungal creams.

1. Topical Corticosteroids: While an ointment like clobetasol is the gold standard treatment for the outer vulva ^[2], internal vaginal involvement requires clinician-selected formulations. Your doctor might prescribe steroid suppositories or a specialized foam ^[13][14].
2. Calcineurin Inhibitors: If steroids aren’t enough or aren’t appropriate, medications like tacrolimus or pimecrolimus may be used to manage the inflammation ^[13].
3. Dilator Therapy: If scarring or narrowing is a risk, your care team may recommend using vaginal dilators alongside your medication ^[4]. These are typically used once active, painful flares are under control, to help maintain the flexibility and width of the vaginal canal.

Treatment for these conditions is often long-term. While they can be managed effectively, they are chronic conditions that require periodic check-ups to adjust your medication and ensure the tissue remains healthy ^[2][15].