Is it possible for depression to go away, then come back again?

I'm a 16 year old girl and got diagnosed with depression when I was 14. I used to self-harm but quit and haven't touched a blade or anything in almost a year. Around this time last year, I started feeling happier again. Like my depression was gone or something. I was confused by it because I wasn't on meds, no counseling, nothing. It just came and went like magic.
Now, I'm starting to feel the way I did when I was depressed. I don't know what's going on. It's just for the past month I've been wanting to cut so bad and I don't even really have a reason! It's driving me crazy!
Maybe it's just teenage hormones, but I really don't know...
Someone please help me out and tell me what you think or whatever...please?

[Roger Gould, M.D.]

this is a perfect time to get some therapy...before you start cutting but while you have the urge...you can find out the source of your depression, and may be able to prevent future depressions with that knowledge..please get therapy.

[zack32]

I am not a Dr. but do know that depression can come and go. You can speak with your Dr. about where to get help. Sometimes as we grow we have have depressed feelings because we are not sure where we fit in. Try writing things down, like your mood in certain situations. Look back at those times so you can see when you where depressed and avoid those situations. Write the good times as well so you can focus on those points. Writing can also be a great out source for your feelings instead of cutting. In your own private writings you can write whatever you want because no one will see it but you.
Also can you talk to your parents? Sometimes they can be a great source of unrealized comfort. They will also be able to help you with a Dr. if need be.
Well I hope you get some needed help and piece of mind.

[Taybey]

I also know depression can come and go.  I was on paxil and took myself off of it due to alot of weight gain.  I do know vitimin D3 works for depression take 1000mgs a day a bit more if needed. this has really helped me out.

taybey