Sudden growth of coffee spots on adults may be caused by genetic factors and pathological factors (such as neurofibroma and melanin deposition).
Coffee spots, also known as coffee milk spots, are similar to the color of coffee mixed with milk, and are relatively common hyperpigmented skin diseases. Each patch has the same color and is very homogeneous, and its depth is not affected by sunlight, and its size ranges from a few millimeters to dozens of centimeters, with clear borders and completely normal skin texture on the surface. The pathogenesis is not clear, the possible causes are as follows:
1. Genetic factors: Coffee spot is a hereditary skin disease, which usually appears after birth or in early childhood, but some of them appear only after adolescence or adulthood, usually without conscious symptoms, mostly benign.
2. Pathologic factors:
(1) Neurofibroma: Coffee spots are one of the more common external symptoms of neurofibroma. It is mainly due to genetic defects leading to abnormal development of nerve cells and caused by multi-system and multi-organ damage, which is manifested as sudden growth of coffee spots on adults.
(2) Melanin deposition: direct exposure to ultraviolet rays will lead to an increase in melanocytes, which is generally manifested as epidermal damage, increase in pigment synthesis, increase in melanocytes in the basal layer, which will lead to sudden cafe au lait spots on adults.
There are other reasons for sudden growth of coffee spots on adults (such as tuberous sclerosis, etc.), it is recommended to go to the hospital in time to identify the cause of the disease and then targeted treatment.