I occasionally have small blood spots where my penis would have come in contact with my underware. It was very infrequent in the past, like maybe once or twice a year. Lately it's been occurring more like once or twice a month. It doesn't seem to be related to intercourse. I have no pain or burning sensation. I'm 67 years old. I take meds for type 2 diabetes, but other than that I'm pretty healthy. Should I be concerned?