Bananas with a few black spots are edible, and the black spots on bananas have nothing to do with melanin. There are a few black spots on the banana skin, which shows that the banana is completely mature and we can safely eat it. Bananas at this time are very sweet, delicate and delicious. The reason why there are black spots on the banana skin is because the banana skin is sick! When the fungus bag of banana produces fungal virus, banana will suffer from carbon jaundice. The disease only occurs when bananas are ripe. Brown round spots will appear on the stalk and epidermis infected by bacteria. If the bacterial infection is serious, the area of circular spots will gradually expand and connect into new large spots. If left unchecked, the whole banana will turn black or even rot and stink in two or three days. However, carbon jaundice generally only hurts banana skin. When we eat bananas with a few black spots on the skin, it won't have any influence on the human body. On the contrary, when you see a small number of black spots on the banana skin, it means that the banana is ripe. At this time, the banana is very sweet and soft. In order to promote the sales of spotted bananas, merchants also beautify bananas into bananas with black spots on their skins, which are called sesame bananas. However, it is worth noting that this banana cannot be preserved for a long time. Long-term storage will lead to more and more black spots on the banana skin, and the black spots on the epidermis will slowly enter the pulp from the epidermis until the pulp inside the banana is also black. Bananas are so rotten at this time that we can't eat them. Melanin mentioned in health care is produced by melanocytes and is the main pigment that determines the color of skin. The change of our skin color is caused by the increase or decrease of melanocytes and dysfunction. When we lack melanin in our body, there will be many adverse reactions, such as vitiligo and albinism. But the spots on our faces are also related to melanosis.