Developed a lump on forehead after having Mohs surgery for a basal cells? 5 months post-op. (photos)

If you still have questions after you have consulted with your surgeon, then I would suggest a second opinion forma Plastic surgeon, Facial Plastic surgeon or Oculoplastic surgeon for an in-person exam. That would be better to examine the tissue than photos alone.

Since the bump was present from the beginning, it is likely that it could represent either a hematoma or seroma.  While evacuation  of these is the standard treatment, continuous warm moist compresses  can help speed up  resolution of  such an entity without surgery. If a hematoma or seroma was present and has resolved, the remaining bumps could represent recurrent or residual basal cell carcinoma or simply scar tissue. A biopsy would then be necessary to determine the next step.