Failing to use the serums prescribed by the surgeon after a hair transplant is not recommended, as it impedes the growth and health of the new hair. The serums are crucial for nourishing and protecting the transplanted hair follicles and help reduce inflammation and itchiness. Not using them as directed results in dryness, irritation, slow growth, infection, and scarring. Following the surgeon's post-operative care instructions is important for the best outcome.