I'm 25 and overweight with a 8cm (10 year) lipoma. Would weight loss and massage help the indentation?

Yes large lipomas can leave indentation, can be minimised by fat grafting. Weight loss and massaging can be contributory.

Dear LK282,
if you have lipoma and lose weight, it is unlikely that the size of your lipoma will change. The best solution for removal of lipoma is surgery. If you are considering a surgery, I would suggest you to consult a board-certified plastic surgeon. Only after a thorough examination you will get more information and recommendations.
Daniel Barrett, MD
Certified, American Board of Plastic Surgery
Member, American Society of Plastic Surgery
Member, American Society of Aesthetic Plastic Surgery

Thank you for sharing your question. In most cases the contour after lipoma removal remains very acceptable as the fat pushed out of the way during lipoma growth returns to its original location when the mass is removed.