Tummy spots may be caused by seborrheic keratosis, lichen planus, pigmented nevus and so on.
1. Seborrheic keratosis: seborrheic keratosis is a benign skin tumor originating from the formation of epidermal keratin, which can appear with the aging of the skin. The etiology and mechanism of the disease are still unclear, and it may be related to the delayed maturation of keratinocytes and the abnormal expression of cell-cycle regulating factors, which is manifested as a light-brown flat rash or plaque that is slightly higher than the surface of the skin.
2. lichen planus: lichen planus is a fungal disease of the skin caused by Malassezia infection, which is caused by Malassezia overgrowth. It can be manifested as a brown rash with clear boundaries at the site of infection, which can be brown due to the increase of pigmentation, or light yellow or white due to the decrease of pigmentation.
3. Nevus pigmentosus: the cause of nevus pigmentosus is still unclear, may be related to gene mutation during development, lesions can be brown, brown, etc., generally slow progress, no conscious symptoms.
It is recommended to go to the hospital in time to get a clear picture of the cause of the disease, and then take active treatment under the guidance of the doctor.