The Cutera excel HR for hair removal is suitable for all skin types. This laser features two different wavelenghts (1064 nm Nd:YAG and 755 nm Alexandrite). The wavelength used is based on skin type.
Sorry to hear of your troubles. Without any knowledge of your skin type, it’s tough to make a useful recommendation. Specific laser settings are not as important as achieving appropriate laser endpoints. For laser hair removal, the appropriate endpoint is to visualize mild erythema and edem...
You should wait until the skin is healed before doing the next dermaroller procedure. At least a couple days. LHR takes at least 3-4 sessions to see results.