I shot some prop in the delt two days ago it was sore and lumpy as ussual and it was my first delt shot in a while. Today I looked in the mirror and I see a faint red blotch on my shoulder the pain is no where bad as yesterday in fact its almost gone and I have a cold right now but I dont feel sick like I have a fever and it doesnt feel any more warm then my other shoulder so is this just a reation or infection?