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Dermatology Dermatology


Both internal factors (genetics, hormones, etc.) and external factors (sun radiation, tattoos, diet, medicinal products, etc.) have an influence on the colour of the skin. In the epidermis, more specifically in the basal layer, there are star-shaped cells (melanocytes) producing a pigment called melanin. It is mainly this melanin that "colours" the skin and hair. The differences in terms of quantity and location of melanin in the various epidermal layers explain the different skin phototypes.

Dark spots in the skin

This melanin production is often not homogeneous and is distributed or synthesised abnormally. This disorder can lead to pigment accumulation in some areas, known as dark spots. For instance, sun exposure stimulates the appearance of sun lentigo and freckles or ephelides, and a hormonal imbalance, such as that occurring during pregnancy or with the use of anovulants, can enhance the appearance of melasma or chloasma. Melasma (or chloasma, the mark of pregnancy) is a brown coloured pigmentation located on the face (forehead, lips, cheeks) with ill-defined edges, much more common in women, which sometimes appear unrelated to pregnancy or contraceptive treatments.  


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