Raycast from inside an object

I'm building the code for a gun right now and the code works fine as in it applies the appropriate damage to an enemy hit. What I'm considering doing though is giving certain weapons pierce the enemy and hit any behind it. My idea was to cast a ray out from the point that the first ray hit the enemy and check if it hit a different enemy.

My thing is the logic in my head is telling me that casting it from the hit spot would collide with the enemy I just shot and do additional damage to it instead of any enemies behind it. I suppose I could avoid that by moving the rays start point a little bit on the forward transform where I would cast it from there but I want to know is if the start point happens to be inside the enemy, will it still collide with the first enemy or will it not return a hit until it hits a new enemies collider (or any walls behind them)?