light brown spots
Introduction
Introduction Freckles are simple, light brown or brown skin spots that mostly grow on the face. The formation of freckles is mainly caused by excessive melanin production by melanocytes in the basal layer of the epidermis of the skin.
Cause
Cause
Melanin is derived from tyrosine contained in foods such as cheese. Under the action of enzymes in the body, tyrosine is converted to dihydroxyphenylalanine, then oxidized, and finally polymerized into melanin. If the melatonin produced by the pituitary gland increases for some reasons, it may cause pigmentation disorders and skin freckles.
Examine
an examination
Related inspection
Skin patch test skin test
1. The small brown spots on the tip of the needle to the large grain of rice, because of its shape and color, such as bird eggs, it is called freckles.
2, freckles occur in the face, neck, arms and other sun parts, the face is scattered on the cheeks and nose.
3, the number of freckles is uncertain, and each does not blend with each other.
4 Generally, when you are young, there are more women than men, often accompanied by family history and no other symptoms.
Diagnosis
Differential diagnosis
Differential diagnosis of light brown spots:
Chloasma: Caused by hormones or stress or liver fire.
Pregnancy: It is caused by hormones and blood stasis in the postpartum body.
