My pet scratch him self a lot
Dermatological problems can have many causes. Therefore, it is essential to perform a comprehensive diagnostic protocol, starting with simple and low-cost diagnostic tests that will allow to rule out the most common causes. Later on, it may be necessary to resort to more complex and specific tests to rule out allergies, autoimmune diseases, hormonal pathologies, etc.
However, a normal discharge of male dogs is light, usually white or pale greenish / yellowish and the amount varies.
If it gets dark brown it can mean an infection as UTI or prostate infection that should be treated with antibiotics.
You should visit your vet in order to determine the diagnosis and the corresponding treatment. In the meantime, keep him from scratching, licking or rubbing the irritated area, and as soon as you can take him to the vet.
All the best.