TBH, it almost sounds like some kind of hormonal problem to me. I've seen a girl with these light and dark patches (not sprayed by me) when she was pregnant. She came to me to ask if there was anything that could be done, and the place she'd gone to hadn't even done a client consultation first, never mind check if she was pregnant.
Now I'm not saying your lady is preggers.....but have you checked she isn't on any meds at all that may affect her hormones? HRT, Clomid? Prepping for IVF? Even some Ayurvedic herbal stuff can affect them....especially things that are taken to regulate cycles or boost fertility? And it's personal question but check where she is in her cycle. If she's about 2 weeks in she could be about to ovulate and some people's skin can be a touch more sensitive then, although tbh, thats a fairly long shot, as I've never seen patches, just a quicker reaction to DHA at this point.
And is she prepping the skin correctly....do you have any prep wipes? So at least you could clean an area for patch testing and know it would be OK?
What was her skin tone originally? And type? Does she have oily skin? Is there anyway her skin could be producing excess oil between her exfoliating and you spraying?
Don't let it knock your confidence hun, the fact that you are on here trying to sort it and caring, shows you are a good therapist.....but tbh, I'd get your machine sorted ASAP, as the Nuress one isn't going to help you confidence, never mind anything else! If you test on yourself and come to think it is the machine, you may be best off simply apologising that you've had equipment failure and offering her a freebie session in a couple of weeks when you've sorted it?
