Would subcision alone help my type of chicken pox scar? Or should I just go for fillers? Or both? (photo)

Hi Nat. We would not recommend either of those choices.  Subcision and fillers alone both involve using fillers to push up a depression from the bottom.  Your chicken pox scar will come up, but it will come up all in one piece leaving you with a bump of filler under the area.  We have filler and use them for depressed areas of the skin that are wider and have softer edges.  But with the hard edges of a chicken pox scar, we would recommend laser resurfacing.  You need new collagen to soften the edges of the scar.  To see examples of laser resurfacing, click on the link below.

Your scar would most effectively be fixed with a dermal filler - so long as the practitioner knows what he or she is doing and has done this before.  We have done this for numerous clients and the results have often been extremely good.  Most often, the depressed scars have been deep acne-related indentations that required filling before being resurfaced with lasers.
Excision would be a 2nd option, although the risk of scarring from the excision alone is always present.  I would see an experienced practitioner and review your options.