Take a break. I suspect you might be doing something when you excercise that is causing them to cluster midshaft. Take a months break or until they disappear would be best, but you can still do the massages and warm wrap which might help them disappear. The warm ups and cool downs are for a reason to help protect the penis like with ay excercise, and remember don't over do it as this can cause permanent damage as mentioned above, so you should be doing them.