Going on testosterone after surgery will generally not affect the results of your chest surgery. Gaining significant muscle in the pectoral area might hide the scar, but it should not adversely impact your outcome.

Chest reconstruction surgery will give you a permanent outcome. However, significant fluctuations in your weight may impact the appearance of your chest. Gaining weight very quickly or soon after surgery could affect your skin or scarring. In most cases, you would need to gain (or lose) a great deal of weight for the chest contour to change substantially.

It is always best to discuss any plans for body changes with your surgeon before surgery.