Vulval Sebaceous Cysts: Symptoms, Causes, and UK Treatment Guide

A vulval sebaceous cyst, also referred to as a sebaceous cyst of the labia, is a small, slow-growing lump that develops beneath the surface of the skin in the vulvar area. These cysts are typically non-cancerous (benign) and are filled with sebum, a yellowish, oily substance produced by the skin's sebaceous glands. In the UK, many women discover these lumps while washing or during routine self-examination and may feel anxious about their cause.

Unlike other types of genital lumps, sebaceous cysts are generally mobile and not attached to the deeper tissues. They occur when a sebaceous gland becomes blocked or when a hair follicle is damaged, leading to the accumulation of oil. According to NHS clinical standards, these are considered a normal variation of skin health and often do not require aggressive intervention unless they become symptomatic.

Most vulval sebaceous cysts are entirely asymptomatic, meaning they do not cause any pain or irritation. However, they possess several distinct characteristics that help differentiate them from other conditions:

• Appearance: A small, round, or dome-shaped bump that may be white, yellow, or skin-coloured.
• Texture: They usually feel firm but can be moved slightly under the skin when touched.
• Size: Cysts typically range from a few millimetres to a couple of centimetres in diameter.
• Location: They most commonly appear on the labia majora (the outer folds of the vulva) where hair follicles and oil glands are most abundant.

If the cyst remains small and painless, it may stay the same size for years. However, if the cyst wall ruptures or if bacteria enter the sac, it can become an abscess, leading to sudden swelling, heat, and intense local pain.

In the United Kingdom, vulval cysts are a frequent reason for primary care visits. The most common cause is a blockage of the duct that normally allows sebum to reach the skin surface. When this duct is obstructed, the oil continues to be produced but has nowhere to go, forming a sac. Factors that can increase the likelihood of developing these cysts include:

• Hormonal Fluctuations: Changes in hormone levels can increase sebum production, making blockages more likely.
• Trauma: Shaving, waxing, or friction from tight clothing can damage the skin or hair follicles, leading to cyst formation.
• Skin Conditions: Individuals with a history of acne or hidradenitis suppurativa may be more prone to sebaceous cysts.

It is important to note that these cysts are not sexually transmitted infections (STIs) and are not a sign of poor hygiene.

One of the most common concerns for patients is whether a lump is a sebaceous cyst or a Bartholin’s cyst. Understanding the difference is vital for correct management. Bartholin’s glands are located near the opening of the vagina and provide lubrication. A Bartholin's cyst typically occurs deeper in the tissue at the 4 o'clock or 8 o'clock position of the vaginal opening.

In contrast, a sebaceous cyst is more superficial, appearing directly under the skin, often on the hair-bearing areas of the labia. While a sebaceous cyst is a blocked oil gland, a Bartholin's cyst is a blocked mucus gland. NICE (National Institute for Health and Care Excellence) guidelines suggest that any new or changing lump in the vulval region should be assessed by a healthcare professional to ensure an accurate diagnosis.

Many women feel embarrassed discussing vulval health in person or find it difficult to secure a timely appointment with their local GP. Speaking to an online doctor in the UK offers a confidential and convenient way to have your symptoms reviewed. You should consider a private consultation if:

• The lump is growing rapidly or changing in appearance.
• You are experiencing pain, itching, or discomfort during walking or intercourse.
• The area is red, swollen, or leaking fluid (signs of infection).
• You are anxious about the cause of the lump and require a professional opinion.

During a consultation, the doctor can review your clinical history and, if necessary, request a photo for assessment or refer you for an in-person physical examination. If the cyst appears infected, an online GP can often prescribe a course of antibiotics for collection at a local UK pharmacy.

If a vulval sebaceous cyst is small and not causing issues, the standard NHS approach is watchful waiting. Many cysts resolve on their own or remain stable without intervention. For cysts that are bothersome, the following options are available:

Home Care

Applying a warm compress to the area for 10–15 minutes several times a day can help soothe the skin and may encourage a small cyst to drain naturally. You must never attempt to squeeze or pop a cyst, as this significantly increases the risk of infection and scarring.

Medical Intervention

If the cyst becomes infected (forming an abscess), a doctor may need to perform an incision and drainage procedure under local anaesthetic. For recurrent or very large cysts, a minor surgical procedure called excision may be required. This involves removing the entire cyst sac to prevent it from growing back. In the UK, cosmetic removal of asymptomatic cysts is rarely available on the NHS, but can be sought through private minor surgery clinics.