How can I make a keloid scar disappear from my neck permanently? (photos)

The scar on your neck appears to be hypertrophic rather than a keloid.  I would recommend a surgical scar revision and it is possible that steroid injections could be used if needed to help with the healing of the scar after the revision. 

Our treatments use combination therapy to improve the epidermis and dermis for most deep scars. The options available for acne scars depend on the character of your scars, in terms of topography and contour. We see atrophic and hypertrophic acne scars, as well as scars that have hypo and hyperpigmentation. We begin each scar evaluation with an assessment of scar quality and subtype. Our main concern is rebuilding collagen and that is why we use a HIDEF protocol that includes combination therapy. Morpheus 8, scar subcision, fibrous release, fractional laser, CO2 laser, Thulium laser, PDL Vbeam laser, and fractional resurfacing can be used in addition to TCA Cross and chemical peels to further improve skin. Patients should start Melarase AM and Melarase PM for active hyperpigmentation. Always begin with a consultation to decide whether early subcision should be started.

Best,
Dr. Karamanoukian
Realself100 Surgeon

This scars looks more hypertrophic than keloidal. I suggest a personal examination to determine the diagnosis and treatment plan. Perhaps a surgical excision and long-term scar therapy would be reasonable.See an expert. Dr. ALDO