Injury doing dips (It hurts only when I go up)

[Davideivid]

Hi:

I injured myself. My anterior right delt hurts. I am pretty sure it was for doing weighted dips but I cannot assure that because I did not feel pain while doing them. It was when I did them in a posterior workout. I have been doing a lot of research and I think It could be a biceps tendon injury or a subescapularis one. But what I read everywhere is that you should feel pain when lower the body towards the floor but only hurts when I go up, even when a corrected tecnique (I guess that I was lowering too much from the 90º). When I do bench press or declined press does not hurt (maybe a slight pain). I have noticed that when I do the "bend the bar" tecnique the slight pain is even reduced, maybe because of the internal rotation.

I know that this is not the doctor's office, but I would like to know your opinion. What do you think?