The HSV-1 positive test is meaningless and not relevant.
The part of the penis you mention is almost always red, especially when irritated. Aldara irritates. I see no reason why you should be using it.
My advice to people with concerns about redness of the penis is to ignore it and do as little as possible to it.
If you're still anxious, ask your dermatologist to have a look again, and then forget about it and move on.
I believe I have a very similar problem to this. Just a red, irritation that I know for a fact was not there until a few months ago. I am uncircumsized and have never had sex or recieved oral sex so STD is out of the question. The irritation seemed to happen after I popped what appeared to be a normal pimple that happened to be on the head of my penis - I wasn't worried about it cause I have had acne appear near my groin a few times before - but popping it was stupid because it inflamed and became very irritated. I put antibiotic ointment (neosporin) on my penis and had it on all day beneath my foreskin and this practice went on for at least a week until the pimple had healed. I had about 3 days in between the antibiotic and the irritation where I had no problems - but I stopped masterbating after the pimple sore started to hurt really bad, so after it was gone with no pain or irritation I started masterbating once a day, then the redness and irritation appeared on the shaft just under the head, and extending only underneath the foreskin, not anywhere on the outer shaft of my penis. I did look online to see if it was a yeast infection, but I am certain it isn't because of the pictures I saw looking alot worse and different. But, I tried putting gold bond on it, thinking it was maybe a fungal growth like jock itch or something. Did that twice, over 2 days, that made it worse I believe - also I noticed a "bruise-like" form on the tip of my head after the goldbond, and also my "ruffa" or whatever the line down the underside of the penis shaft is called, it became bright red and more noticable than I had ever witnessed on myself. After this didn't go away I visisted a urologist who insisted that this was entirely anxiety driven and that nothing was wrong, but it still is there, and seems to become more irritated after masterbating or showering. What can I do?? is this because of the antibiotic ointment?? thanks