Labiaplasty 1 What Is Labia

Those who come after reading a blog post often ask, "What exactly does the labia minora refer to?" Because it is an area so hard to look at directly, it is only natural to be confused even about its location. This article, the first in the labiaplasty series, aims—before getting into the procedure talk—to point out anatomically where the labia minora sit within the vulva, what they do, and why their shape and size differ from person to person. Once you know the structure of your own body, vague worry often eases.

The labia minora are the innermost folds of the vulva, sitting as a left-right pair inside the labia majora. Looking from the outside inward, the thick outer folds, the labia majora, come first, and inside them are the thinner folds closer to mucosa, the labia minora. The anatomical descriptions of the American College of Obstetricians and Gynecologists (ACOG) and StatPearls (2023) likewise divide the vulva into the labia majora, labia minora, clitoris, and vestibule, and describe the labia minora as a structure that surrounds the central passage from the left and right.

If you gently part the labia minora left and right, a flat space is revealed inside, which is called the vestibule. In the clinic, within this vestibule there is a small urethral opening toward the top and, below it, the vaginal opening. At the uppermost part where the labia minora begin, the left and right folds meet and continue to the clitoris, which is covered by a thin fold of skin called the clitoral hood. In other words, the labia minora are not mere folds of flesh but are placed in a position surrounding the most sensitive and important openings of our body.

Though the labia minora look thin, they are an area where several tissues are densely gathered. The outer side is close to skin, and toward the inside it naturally continues into pink mucosa. Within them are distributed blood vessels, nerves, sebaceous glands, and sweat glands. Many people are surprised, asking "is there sebum here too?", but because the labia minora also have sebaceous and sweat glands, changes can occur just as with other skin.

In fact, there are occasional cases where someone comes for examination because a small pimple or sebaceous cyst is felt before or after menstruation or when their condition is run down. Most are common changes caused by a blocked sebaceous gland, but if there is pain or the size grows quickly, it is better to get an examination once to distinguish other causes.

The fact that they are rich in blood vessels and nerves means two things. One is that they are sensitive to stimulation and sensation, and the other is that a careful approach is needed during surgery or trauma in the process of bleeding and recovery. This part will be covered more in the surgery-related articles later in the series.

The labia minora are small but play a clear role. Because of their position surrounding the innermost openings, they simultaneously perform the following functions.

• Protective function: by covering the vaginal and urethral openings, they serve as a first line of defense so that external bacteria or foreign matter does not easily enter.
• Lubrication maintenance: the mucosa and surrounding secretions reduce dryness and friction, easing discomfort in daily life and during intercourse.
• Sensory function: nerve endings are abundant around the clitoris and in the labia minora, taking part in sexual stimulation and sensation.
• Environment maintenance: secretions and mucosa help keep the environment around the vaginal opening constant.

StatPearls (2023) and various anatomy and physiology texts also describe the labia minora as "a structure that protects the opening, reduces friction, and takes part in sensation." When explaining to patients in the clinic, I tend to liken them to "not a dispensable area, but a threshold that guards the entrance." That is why it is important to first understand their location and function.

The question I receive most often about the labia minora is "is my shape normal?" To say the conclusion first, the labia minora have a very wide range that can be called normal. Just as facial features differ from person to person, no two people are identical in the length, width, color, and form of the labia minora.

Actual studies also support this. The length of the labia minora in women of reproductive age is reported across a considerably wide range depending on the individual (there are studies reporting up to the 20–100 mm range), and ACOG (2017, 2024) takes the position that being outside this range does not in itself mean abnormality. In other words, it is more accurate to view it as there being no single clinical baseline of "the labia minora are normal at such-and-such a size."

Anatomical reviews dealing with diversity (2021, 2025) likewise organize left-right asymmetry and differences in color/size as "normal variation that is not functionally problematic." It would be good to keep in mind that color or asymmetry in itself is not a sign of disease.

As seen above, diversity is part of normal, but not every change is something you can simply watch. Because you cannot simply divide normal from abnormal by appearance alone, it is reasonable to base judgment on "symptoms" rather than "appearance."

For example, if there is unusual pain, recurring chafing or difficulty with hygiene management, friction discomfort in exercise/daily life, a suddenly felt lump, or a marked change in color or discharge, I recommend getting an examination once. Frequently accompanying concerns such as itching or pigment change have different approaches by cause, like vulvar itching or Y-zone pigmentation, so it is safer to check the cause through consultation rather than self-judgment.

Conversely, if the only reason is simply "my shape seems different from others'," what is needed in many cases is not a procedure but accurate information about the normal range. ACOG also recommends that, for anxiety about appearance, education and reassurance about normal variation come first. If you are hesitating, you may lightly ask via if you are worried about symptoms, ask first remotely.

Once you understand the location and function of the labia minora, subsequent topics such as "why they are shaped this way" and "in which cases to consider examination or correction" connect much more naturally. As articles dealing with the same area, it helps to also read why labia look this way and the story of normal vulvar anatomy, which covers the normal anatomy and variation of the whole vulva.

When examination is needed for discomfort symptoms, within women's health care we check the condition and, considering individual differences, discuss the direction of management and treatment together. The key is to look based on daily discomfort and symptoms rather than appearance itself, and costs and methods will be provided after consultation.

At Apgujeong Woahan Women's Clinic, we diagnose the health condition of the vulva, including the labia minora, and, when needed, provide a management or treatment method suited to the individual. If shape or symptoms bother you, I recommend checking accurate information first through consultation rather than reaching a conclusion alone through searches.

Written by: Lee Dong-hee Director · Obstetrics and Gynecology Specialist · View medical staff profile

First published September 16, 2025 · Last reviewed May 30, 2026

References: American College of Obstetricians and Gynecologists (2017, 2024), StatPearls Female External Genitalia (2023), Anatomical review of labia minora normative datasets (2021, 2025)

This article is intended to provide general health information and does not replace individual diagnosis or treatment. If you have symptoms, please consult through an examination.