Final answer:
Lichen sclerosus, morphea, and postinflammatory hypopigmentation are three causes of leukoderma associated with atrophy, leading to depigmentation and skin changes.
Step-by-step explanation:
The three causes of leukoderma associated with atrophy are: Lichen sclerosus, morphea, and postinflammatory hypopigmentation. These conditions result in skin changes such as depigmentation and skin atrophy. Lichen sclerosus is characterized by thin, white patches on the skin, which are prone to bruising. Morphea, also known as localized scleroderma, is a condition characterized by the hardening and thickening of the skin and connective tissues. Lastly, postinflammatory hypopigmentation can occur following skin trauma, infections, or inflammatory diseases where melanocytes are damaged, leading to lighter skin patches.