Moles generally refer to pigmented nevi, and the sudden growth of a mole on the little finger of the left hand is mostly related to abnormal embryonic differentiation, external stimuli and genetic constitution.
1. Abnormal embryonic differentiation: mostly seen in congenital nevus, usually present at birth or within a few days after birth. The cause of embryonic abnormal differentiation due to gene mutation is still unclear.
2. External stimulation: Acquired nevus pigmentosus is generally associated with local external stimulation of the skin, long-term exposure of the skin to the sun, long-term use of glucocorticoid drugs, local trauma may lead to nevus pigmentosus. Fingers are often in contact with the outside world, so they are susceptible to external stimulation.
3. Some people have a hereditary mole-loving constitution and have more moles than others, which is hard to change.
If a pigmented nevus appears on the little finger, it is recommended to go to the hospital in time to see if there is any risk of lesions, and if there is any risk of lesions, it should be removed in time.