not really. sometimes it will seem like it goes away but it doesnt. its still there. the one thing that can possibly keep off depression is medicine and therapy. now if your depression is something simple like a person died in your family then it might go away (depends on how bad it affected you). but a lot of depressions (this is why i said the other was simple) have no reason for it whatsoever. a person will become depressed for absolutely no reason
Depression can be completely cured whether it is major or clinical depression. However, this is only possible through medication and cognitive behavioral therapy if needed. In some severe cases, procedures like vagus nerve stimulation, electroconvulsive therapy and deep brain stimulation are also used.
It can go away, but it is best to see a doctor to help it along. It's like any injury or illness. If you do nothing, you will probably get better anyway. But if you follow a doctor's orders or receive treatment, you may heal faster and probably better.