If it’s warm, hot to the touch, red irrigated or extremely painful I would go to doctor it could be infected. It is most likely oil (test e) build up from the sub q injection. It will most likely absorb into the muscle over the next couple of days… I am no doctor but I can only tell you what I know from experience, that is why I dislike sub q injections so much. If you get exclusive oil build up it can cause discomfort and pain for days but should eventually absorb into the muscle… IM is the way to go, everything will need to absorb into the muscle anyway and once you get a routine down on injections and injection sites should be quick and easy with a lot less PIP .