I have been using a vacuum pump for over a year. The last 2 times I used it, there were red spots (some as big around as a pencil eraser) on the head and foreskin area. What may have caused it and what can I do to prevent it?

how do I choose between a standard or extended foam sleeve.

When I inject Tri-Mix, I use a cock ring to help hold the medicine in. Though the ring doesn't seem tight and there is no bleeding at the time of injection, the next morning there is a lot of discoloration on my penis. Does anyone know what is causing this or how to avoid it?
65 year old diabetic.