There are several reasons one could have blisters on the penis. It's not always genital warts.
Working out won't cause fever blisters.
Trichomoniasis can cause a rash with red spots and itching, but doesn't cause blisters.
sunburns cause water blisters
Friction can cause blisters, yes - however, many sexual diseases cause blisters as well. If you have blisters on your sexual organs, you should see a doctor to make sure it's not a disease.
No not all blisters are herpes. Some are just water blisters from chaffing, some types of eczema can also cause blisters.
No....
One genital wart is a condyloma; the plural is condylomata.
Yes, from where the leg meets the stump if it is not fitted correctly in can cause blisters.
Yes
Most certainly not.
Herpes ... see your doctor soon.
Yes. Skin contact with boiling water can cause swells and burns, with may turn into blisters, and the blisters can cause scaring.