A well-demarcated, coin-like, dark brown lesion appeared on the shoulder of a 59-year-old man. The lesion appears velvety, greasy, and has a "stuck on" appearance so that it can easily be removed. Which of the following is the most likely diagnosis? 
Definitions:
Complements
Goods or services that are used together, where the demand for one is increased when the price of the other decreases.
Baby Boom
A significant increase in the birth rate, particularly the post-World War II population surge between 1946 and 1964.
Quantity Demanded
The total amount of a good or service that consumers are willing and able to purchase at a specific price.
Preschool Services
Educational and care services provided to children, typically between the ages of 3 and 5, aimed at early childhood development and preparation for formal schooling.
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