The ageing process takes place in the genital-perineal and adjacent areas in the same way as in the rest of the body. Because of this, loss of elasticity and firmness as well as a change in the colour of the area can be seen.

Intimate hyperpigmentation is caused by an excess formation of melanin that involves skin darkening around the anal and external genital area.

In addition, the fact that melanocyte activity is greater in this area than in the rest of the body is also responsible for the high prevalence of the color change affecting it.

It is a concern of multifactorial origin, and the main triggering factors include : 

Internal Factors :

Age 
Ageing of the vaginal tissue is caused by changes in the biological, biochemical and molecular mechanisms that can result in pigmentation disorders.

Genetic Predisposition 
The prevalence is higher in people with high phototypes.

Hormonal Changes 
The increase of estrogens stimulates the activity of the enzyme tyrosinase responsible for the increased melanin production.

External Factors: 

Care And Beauty Habits 
Techniques such an depilation can cause abrasion and folliculitis, leading to skin inflammation that results in an increased production of the melanocytes and therefore of melanin.

Clothing Habits
When the skin experiences fiction, it naturally thickens (hyperkeratinisation) and darker areas appear. It often affects the inner thighs in the case of frequent use of tight pants or underwear.