Would like some adviced in something that i noticed this afternoon when i went to feed my chicks, i grab my BLRW roo which is around 6-7 weeks, when i touch him i felt like i hurt him when i touch him and i noticed that in his left side chest was very soft i check him and i noticed a big air bubble kind of thing in his chest i have never seen this before thats why im very worried for him is like the skin is separeted from the muscle with air or water not sure whats inside hes acting normal, eating, drinking and even playing with the other chicks but i dont know if this is gonna go away or should i do something about it, please help im very worried