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How to pick your nose inconspicuously
Position the index finger of the opposite-side hand alongside the exterior of the obstructed channel.
Nonchalantly slip the thumb as deep as necessary into the nostril.
Using the thumbnail, delicately clamp onto the dried mucous mass.
Slowly withdraw the thumb and its payload from the nostril. At this step in the process be particularly vigilant for any trailing mucous which might be attached to the payload.