Any infection cause inflammation, and one sign of inflammation is swelling, or edema. The penis skin has a lot of give to it, so fluid under the kin will be quite visible--the same thing happens around the eyelids. I expect that this edema will go down by itself. Any recurrences of herpes will likely be much milder and shorter-lived, and will probably not have much or any edema associated with them.
Take care.
Dr. Rockoff