Black patches on the body may be caused by melanoma, seborrheic keratosis, acanthosis nigricans and other factors.
1. Melanoma: when the local melanocytes have malignant changes, it will lead to local skin cell DNA damage, which will make the new cells appear out of control and form a large number of cancer cells in the local area, leading to the symptoms of black patches on the body.
2. Seborrheic keratosis: Seborrheic keratosis, also known as senile warts, age spots, basal cell papillomas, is one of the most common benign skin tumors, prevalent in middle-aged and elderly people, due to the benign epidermal hyperplasia caused by keratinocyte proliferation. It is usually formed due to the aging of the skin with the increase of age.
3. Acanthosis nigricans: If the patient suffers from acanthosis nigricans, it will also lead to the symptom of black plaques on the body, which is mainly due to low immunity, obesity and other factors. This disease is often manifested as gray-brown or gray-black papillary or velvety thickening of the skin in the folds of the neck, armpits, groin and other parts of the body.
There may be other reasons for the black patches on the body, it is recommended that patients go to the hospital in time to improve the examination to clarify the cause of the disease, and then follow the doctor’s instructions to give targeted treatment.