No problem, if it doesnt hurts then it could be a torn muscle,have you tried to put some reflex on it? dont know if you know what i mean but ,you spray it on a part of your body which hurts and its makes your muscles warm. If it keeps hurting after your week of resting then go to the docter
Ow and the red spot was an indication or symptone of the costochondritis. Hope you recover soon from it m8!