Hi thanks for your question.
At this age prostate
is usually enlarged and infected resulting in difficulty in passing in urine.Blood vesscels are also very fragile at this age and get bruised very easily.That is what has happenened to your husband.He has sequezed his penis to pass urine,in doing so he has bruised his penis.There is nothing to worry,just consult a urologist
who will be able to manage his prostitis as well as bruise of your husband.He may need a course of antibiotic.
Hope this answers your question.