Over time, the body's pool of melanocytes - stem cells found in each skin particle and hair follicle that produce and store pigment - dwindles.
随着时间的推移，身体的黑素细胞库——发现存在于每个皮肤粒子和发囊里的产生和存储色素的干细胞——逐渐减小。
Melanoma: Dark-coloured malignant tumour of skin cells that produce the protective skin-darkening pigment melanin.
黑素瘤：一种从黑素色素皮肤细胞产生的黑色肿瘤。
The spots arise when groups of cells begin producing pigment in response to repeated stress or irritation of the skin.
这些黑斑在大量细胞由于反复压力或皮肤受到刺激产生色素时出现。
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