As was mentioned earlier, not all masses are lipomas. That being said, a good physical exam and history should be able to give your doctor a good idea about what it may be. In regards to the procedure, it is safe and can be done in 30-45 minutes. the incision can be hidden within one of the wrinkles of the forehead without a problem. The only thing to know is that with lipomas that get excised from the forehead you can get quite some swelling over both brows and eyes that can last a week. There are also other treatment options depending on size and location within the tissue - it is best to discuss all these options with your surgeon at the time of consultation. Hope that helped.