Ok so I haven't ridden my bike too much over the past few months because whenever I let the bike sit for a few days the rear tire goes flat. Finally I've gotten sick enough of it to check things out. I bought a spray bottle and went over the tire with some soapy water (after reinflating it) and what I've found is shown in the picture below.
So as you can see on the left side of my rear tire there are several leaks at the junction between the tire and the rim. There is also a small leak on the right hand side of the tire in just one spot, again right where the tire meets the rim.
First off, what could have caused this - bad tire install? Bad tires? I had these tires installed a little over a year ago at a local shop - I don't think this problem has been going on for that long but that might not be accurate. I've only ridden something like 800 miles on them.

So as you can see on the left side of my rear tire there are several leaks at the junction between the tire and the rim. There is also a small leak on the right hand side of the tire in just one spot, again right where the tire meets the rim.
First off, what could have caused this - bad tire install? Bad tires? I had these tires installed a little over a year ago at a local shop - I don't think this problem has been going on for that long but that might not be accurate. I've only ridden something like 800 miles on them.