Final answer:
The characteristic features of the rash associated with adult-onset Still's disease include an initial cold-like symptoms with high fever, followed by a macular or papular rash three to five days later. The rash is often evanescent and may involve various areas of the body.
Step-by-step explanation:
The characteristic features of the rash associated with adult-onset Still's disease include an initial cold-like symptoms with high fever, followed by a macular or papular rash three to five days later. The rash is often evanescent, meaning it comes and goes, and may involve various areas of the body. It can be accompanied by other symptoms such as joint pain, muscle pain, fatigue, and enlarged lymph nodes.