What are the risks of lumps with nano fat? Can you give me some percentage? (Photos)

I had a phenol croton peel done one year ago that has left me with patches of hypopigmentation and scarring across both my cheeks. One practitioner has recommended micro needling with nano fat and maybe Regenera, but I'm scared of causing more damage with microneedling. Another practitioner is prepared to do just nano fat. I've read how nano fat can help reverse dermal fibrosis. Is there any risk of lumps with nano fat or making anything worse?