I have noticed some white patches on the head of my penis. They are not very clearly defined, don't have a different texture to the rest of the skin, but they're there. One is a couple of millimeters long; another is about 6 mm in diameter. Also I've noticed that a nasty (fishy?) odor comes from my genital area if I miss shower for a day.
Is any of this abnormal?
This sounds like it might be a yeast/fungal infection. Try some antifungal cream - anything from a pharmacy for tinea or ringworm or thrush would be fine. Try it for a couple of days, and if it works, keep using it for two weeks after it's cleared up.
Thank you for the advice!