1. Types of stains
Pigments include freckles, dark spots, chloasma and age spots, etc., which belong to pigmented skin diseases.
2. Freckles
Autosomal dominant hereditary skin diseases often appear when they are young, and are more common in exposed areas such as the face, neck, and back of hands of adolescents. It is light brown or dark brown spots, mostly scattered symmetrically, with genetic tendency. Intensified in spring and summer, lightened in autumn and winter.
3. Melasma
It is an acquired localized hyperpigmentation disease. It is the most common skin disease in the female population, especially for women in the 2nd to 5th month of pregnancy. It is also called butterfly spots, pregnancy spots, liver spots, etc. These are the same Diseases are named according to their shape and age characteristics.