Does 0.5 mm Derma Roller work on this chicken pox scar? (Photo)

I don't recommend using 0.5 mm for scar treatment. chicken pox scars are more resistant to the usual treatment and they would require subcision along with PRP  & microneedling with more depth (say 1.5-2mm). also, in some resistant, cases excision may be required.I would advise you to consult a dermatologist to know your best optionsAll the best 
Dr Jyoti Gupta 

I agree with Dr Gupta, pathology of chicken pox scar is very different to atrophic acne scars. You may get very little traction out of the 0.5 roller, however if you are sensible you can give this a go before seeing a dermatologist. Dr Davin S. Lim, Brisbane. Australia.