Are there any cures or treatments for hole in the head?

1st I think you have posted in wrong area and should be in "help" if your fish has it or in oscar fish if you are just asking but dont worry. yes the best cure is good clean water condition free from nitrates or very low in nitrates. below 40ppm. if you have very good water conditions then you will not get HITH. this is the best cure too. but you could try Octazin if you live in uk. A Vet could also help far better with treatments. At the top right of this page is helpful articals with a page on HITH. this is very good starting place to learn.

Welcome to OFL

Before we start recommending treatments, let us first try and determine how bad your situation is. In many circumstances, hole in the head disease can be cleared up without the need for medicating the tank. However, it really does depend on how bad it is. Could you provide us with some good close-up photographs so we can have a good look.

The next step is to test the water for ammonia, nitrites, nitrates and pH. Fish don't develop this disease for no reason. Even though the disease is not fully understood, it is thought that there are two factors that contribute to its development, these are poor water conditions, and an unsuitable diet.

If you could also provide us with the size of tank you are keeping your fish in, and also the filtration you are using. How often do you do water changes, and do you clean your filters? it would also be helpful to know what sorts of diet you've been feeding your Oscar.

Sorry for all the questions, we need to get good background of how you have been keeping your fish, this will help in the long run.