Your outcome with labia minora reduction could achieve the look you desire. Your results will absolutely depend on your body's preparation to endure the procedure & heal well & on the skill of the provider you choose.
I recommend that you see a medical provider for your HydraFacials & that you have a clarifying HydraFacialMD treatment (30% glycolic, salicylic combination) or that you have a deeper peel. I also recommend that you work in tandem with the medical provider to develop an ongoing treatment & prevention protocol to manage the acne, which will necessarily involve further investigation into its causes. Your acne may not simply be acne. It may have hormonal or infectious causes that are not properly treated with blue light therapy or differin. I recommend that you see a medical provider only & not receive treatments from aestheticians, if your desire is to have true resolution of your concern.
A one-time HydraFacial is not a permanent solution for acne, although it may temporarily alleviate the appearance/symptoms. I recommend that you work with your skin care provider (ideally, a medical provider) to determine the cause of the acne & develop an ongoing treatment & prevention protocol. HydraFacials may well be an important component of that protocol, but you may also opt for longer term solutions, depending on the recurrence of the acne & the severity of its damage. A HydraFacial generally starts at $149-199 for a single treatment.
You can have a HydraFacial with lupus, but I do recommend that you see a medical provider with an in-depth understanding of autoimmune conditions & their effects on the skin. Often, patients with autoimmune conditions are particularly sensitive to certain ingredients or products, which can cause their skin to react in ways that others may not.
These treatments can absolutely be performed on the same day. I would plan to have the HydraFacial treatment first & follow with the PRP treatment.