A third nipple, medically known as a supernumerary nipple, is an extra nipple that can appear on the body. Because of its size and appearance, it is often confused with a mole or birthmark. However, there are important distinctions that help identify a third nipple accurately.
What Is a Third Nipple?
Definition: A third nipple is a congenital (present at birth) extra nipple beyond the usual two.
Location: It typically appears along the mammary ridge (also called the milk line), an imaginary line running from the armpits down through the chest and abdomen to the groin area. This is where breast tissue develops during fetal growth.
Appearance: Unlike moles or birthmarks, third nipples often have a slightly raised or textured surface. They may feature a small, pigmented area resembling an areola (the darker skin surrounding a nipple) and sometimes even tiny hair follicles or glandular tissue beneath.
Size: They vary in size, ranging from barely noticeable tiny bumps to ones that closely resemble a normal nipple.
How to Differentiate a Third Nipple from a Mole or Birthmark
Feature Third Nipple Mole or Birthmark
Location Along the mammary ridge (armpit to groin) Can appear anywhere on the body
Texture Slightly raised, bumpy, or textured Usually flat or slightly raised but smoother
Color May have a small areola-like pigmentation Varies widely; often uniform color (brown, black, red, or pink)
Shape Round or oval with defined edges Can be irregular or well-defined
Other features May have fine hairs or glandular tissue No hair or glandular features
Is a Third Nipple Harmful?
Generally, no. Third nipples are benign and usually do not cause any health problems.
They do not require treatment unless for cosmetic reasons or if they cause discomfort.
Rarely, they can develop similar conditions as regular nipples, such as irritation or very rarely tumors, so any changes should be evaluated by a healthcare professional.
When to See a Doctor
If you notice changes in a mole, birthmark, or suspected third nipple—such as rapid growth, color changes, bleeding, pain, or other unusual symptoms—consult a dermatologist. They can provide an accurate diagnosis and recommend treatment if necessary.
Summary
A third nipple is a small, extra nipple typically found along the body’s mammary ridge, distinguishable by its slightly raised, textured appearance and occasional pigmentation resembling a normal nipple’s areola. In contrast, moles and birthmarks can appear anywhere, are usually flat or uniformly colored, and lack the nipple-like features.
Understanding these differences helps in identifying these skin features correctly, ensuring peace of mind and appropriate care when needed.