I uploaded a symmetrical model in the A-pose. After the rigging was complete, when I selected the T-pose, there were assymetrical distortions to the neck, shoulder, and back. I have not had this issue before with other humanoid models. I am not sure how I can fix this without sculpting. I have a provided a screenshot of the model in Blender with the problem areas circled. Any help is appreciated.
the best way to fix it would be to make your model in Tpose to begin with... that is stop it getting distorted when stretched out of A pose