The darkness of armpit melanin is related to obesity, heredity, post-inflammatory hyperpigmentation, hormone secretion imbalance and other reasons, which can be removed through weight loss, drugs, laser cosmetic, skincare products and other ways. 1. Obesity: obese people are prone to melanin darkness in the armpits, at this time you can lose weight, weight control is reasonable, armpit melanin darkness will be reduced. 2. Heredity: when the darkness of armpit melanin is caused by heredity, you can use skin care products containing niacinamide and other ingredients to whiten the skin, and you can also use laser cosmetic technology to help whiten the armpits. 3. Post-inflammatory hyperpigmentation: Inflammation of the armpit skin, ulcers, rashes and other skin problems, the armpits are prone to melanin pigmentation after improvement. Usually pay attention to armpit sunscreen, armpit melanin darkness will slowly fade over time. 4. Hormone secretion imbalance: estrogen levels rise, the local folds are prone to melanin darkening phenomenon, you can pay attention to diet, eat less estrogen-rich food, pay attention to regular work and rest, you can also use hydroquinone cream to lighten the melanin. If you want to remove the darkness of armpit melanin, you can go to the regular hospital in time, the medication should be guided by the doctor.