If you don't inject deep enough...did you basically waste an injection? I mean obviously it has to be shot IM, but what happens to the oil if you didn't go deep enough?

I read somewhere on here that a guy developed a lump underneath his skin on his glute from not using a long enough needle, and that the site becomes very sore. I'm sure this question is alittle elementary, but I am just curious, I always use 1 1/2 inch needles so I've never run into this problem.