Most white spots on the chest are due to vitiligo or other causes of hypopigmentation. The common one is vitiligo, but it can also be a post-inflammatory depigmentation spot, or a petal-like white hypopigmentation spot that forms after inflammation like lichen planus occurs. There is also a possibility of anaplastic nevus, which is a congenital lack of melanocytes and no way to produce melanin, and a certain amount of white spots may appear locally. In addition, there is also the possibility of anemia nevus, which is a localized skin atrophy due to vascular dysfunction, and white patches. There is also a possibility of pemphigus, which is also a localized white patch of skin.