how to bleach your knee

The skin over the elbows and knees are particularly elastic and resilient. You will notice that the pigmentation is more apparent when your joints are extended and the skin overlying the joints is contracted and redundant. The pigmentation is a reflection of the type of skin around the joints and the fact that there is constant friction between these thickened areas and the environment.

在肘部和膝盖皮肤特别弹性及回弹。你会发现，色素沉着更明显，当你的关节被伸展和皮肤上覆关节收缩和冗余。色素沉着是关节周围的皮肤类型和事实，那就是这些增厚区域与环境之间不断摩擦的一种反映。