Need help on the exact issue. Take?

Respected Doctors, my son is going through a disease called DLE ( discoid lupus erythematosus ) and his major visible issue is lesser hair growth in all of the body sections. Previous doctor diagnosed him and just after that his hair growth is drastically stopped. Even earlier doctor treated him for alopecia for many months and when noticed that still the condition is not stable he go with the biopsy and after then we came to know that its another issue which is DLE. Also earlier Doctor injected him intralesional injection twice. He is very young and no lw wearing a hair patch. I just can't see him like that. Earlier he has very long and depth density of hairs and no he is fighting with a disease. I need to know whether it is curable or not and also what safely step we should take? I have reports and prescriptions of his earlier diagnosis. Need a small brief on this issue and whether it is 100 % curable or not and how much time will takes.