Final answer:
The best place to observe for the presence of petechiae in dark-skinned individuals is on the mucous membranes.
Step-by-step explanation:
The best place to observe for the presence of petechiae in dark-skinned individuals is on the mucous membranes (e.g., inside the mouth). Petechiae are small red or purple spots on the skin that result from blood leaking out of damaged vessels. They can appear as dark lesions on the palms, soles, fingertips, toes, or mucous membranes. While they can be observed on the palms and soles of the feet, they may be more visible and easier to spot on the mucous membranes.