Based on the symptoms you have described, it seems like you may have a skin inflammation on your penis accompanied by a fishy odor. It is recommended to use two creams that can be purchased over the counter at a pharmacy. One cream is an antifungal called clotrimazole, and the other is a 0.5% hydrocortisone cream for inflammation. You can apply these creams thinly twice a day for 7 days. It is also important to maintain good hygiene with a mild unscented body soap to prevent further irritation. If the symptoms persist, it is best to seek medical advice.