Self-Harm (Inflict Pain on Themselves)
Self-harm could indicate one is depressed, if your friend/family or your kid is into self-harm you should immediately see a doctor. They try to cut themselves, but if you look properly at those cuts, those cuts are more like scratches. As mentioned above, they do all of this to get something, so find out the reason.
Depressed about Certain Things Only
You know they are faking depression when they are only depressed about certain things. The most important fact about people. They are happy half of the day and the other half they show that they are depressed.