Final answer:
The deceptive marketing practice described in the story is using deceptive packaging and advertising to mislead consumers.
Step-by-step explanation:
The deceptive marketing practice described in this story is using deceptive packaging and advertising. The company labels its package as 'acne relief' and claims that the user will see an improvement in five days, even though there are no laboratory studies showing the product's effectiveness.
By using these deceptive claims and packaging, the company is misleading consumers into believing that the product can cure acne.