Looks like lesion is on a mobile area like in you case elbow joint. Any injury over the joint area,in people prone for keloid and hypertrophic scars, would end up getting them.
You can keep taking intralesional injections and fractional laser to reduce it.
Next Steps
Massaging the lesion with moisturiser or silicone containing gels to reduce scar will definintely reduce the tendency of hypertrophic scar.
Health Tips
visit a dermatologist