I did the same thing in left delt.
what usually happens is with larger volumeous delt injects in exact same spot, you tend to start building a little scar tissue, its a small muscle. Once the scar tissue starts and you inject there again, your injection solution gets stuck between the skin/subQ layer and scar tissue and can not be absorbed through the muscle tissue to the blood stream. so it just sits there and creats a lump.
Just do a deep muscle tissue massage on it and it will move/disperse the injection to other parts of muscle tissue away from scared area and should absorb. push hard deep and all the way across the entire muscle area. Mine was red and hard, and I did this a few times an now its back to normal. Just take a nice long break from injecting in that area.
hope this helps.