It is unusual for eyelashes to fall out after surgery, and usually this is temporary. If at a year out they have not grown back, it is unlikely that they will. Hair transplant has been done for this.
The condition you describe in not uncommon and relates to to the continued healing of the surgical area. What you describe is less of a pigmentation and more of a vascular congestion. This commonly resolves with time. Continued care with your surgeon is an excellent strategy.
Be healthy and...