A cap for a dermal tissue lancing device includes a retainer and a ring-shaped cap body. The retainer has a proximal end configured for engagement with the dermal tissue lancing device, a distal end with a cap body engagement feature and an opening. The ring-shaped cap body has a distal compression surface, borders the opening and is securely and revolvingly engaged with the cap body engagement feature. When a force is exerted on the distal compression surface during use of the cap, the ring-shaped cap body revolves (e.g., inward with respect to the opening) while remaining securely engaged with the retainer.
