There is no test for males to see if they have genital warts. The only way to know is if you go to the doc when you have the symptoms. They should know what it is. I would just keep an eye on it and see what happens.
that is completely untrue that they develop in clusters. my boyfriend has had about five genital warts now and they all have been "alone" so to speak. some have appeared on his penis shaft, others on the region above the penis, where the pubic hair grows. so no, they dont always appear in clusters.