Mackley CL, Marks JG, Anderson BE. Delayed-Type Hypersensitivity to Lidocaine. The tip was positioned at 50 ?m from the substrate using a 20 mmol L-1 methyl viologen solution as redox mediator. Don't use this medicine while pregnant without first talking to your doctor. Then they wonder why penis redness, penis red spots, and penis bumps appear, along with red marks and abrasions on the penis.