Underarm Pigmentation
What is Underarm Pigmentation?
Underarm pigmentation refers to the darkening of the skin in the underarm area caused by increased melanin production. The skin may appear brown, grey-brown, or uneven in colour compared to the surrounding areas.
While underarm pigmentation is not a medical condition, it is often associated with repeated friction, inflammation, hormonal influences, or skin irritation. In some individuals, it may also be linked to underlying medical conditions that require further assessment.
What Causes Underarm Pigmentation?
Friction
Repeated rubbing between the skin or against tight-fitting clothing can trigger chronic irritation and stimulate pigment-producing cells, gradually causing the underarms to darken.
Shaving and Hair Removal
Frequent shaving, waxing, or other hair removal methods may cause repeated micro-injuries to the skin. Over time, this ongoing irritation can lead to post-inflammatory hyperpigmentation.
Post-Inflammatory Hyperpigmentation (PIH)
Skin inflammation caused by folliculitis, ingrown hairs, eczema, or allergic reactions may leave behind persistent pigmentation after the skin has healed.
Hormonal and Metabolic Factors
Certain hormonal changes and metabolic conditions, such as acanthosis nigricans, may cause darker, thicker skin in the underarm area. In these situations, medical evaluation may be recommended to identify any underlying health concerns.
Excessive Sweating
Persistent sweating creates a warm, moist environment that may increase friction and skin irritation. Although sweating itself does not directly cause pigmentation, it can contribute to conditions that stimulate excess melanin production.
Genetics
Some individuals naturally produce more melanin or have a greater tendency to develop pigmentation following skin irritation or inflammation.
