Final answer:
Prior to the consult segment in a skin care service, a skin sample is taken from the client from their chosen part of the external skin surfaces to determine their skin type and conditions.
Step-by-step explanation:
Before beginning the consult segment of the skin care service, a skin sample is usually taken from the client. The client will decide from which part of their external skin surfaces they would like the sample to be taken. It is crucial that only external surfaces are considered for sampling to ensure safety and hygiene. This sampling process is typically part of a broader effort to understand the client's skin type and any specific conditions that might affect the choice of treatment or products during the skincare service.