Hi I was just wondering if anyone knows whether prolonged use of a vacuum pump can cause permanent bruising or skin discolouration on the penis over time. I have been using my somaerect virtually everyday for 19 months for exercise sake , but am noticing a distinct darkening of my penis in various areas. Now I am on daily Cialis and getting natural erections is it still worth using this device ? I tend to think so although my clinic said I could back off on it. I've just achieved so much over this time that I'm loathe to lose it tbh , but at the same time worried I could be actually doing long term harm. Any advice gratefully received