So a client of mine has suddenly had an allergic reaction to eyelash tint, it wasn't extreme but enough to give us both a scare. She had a patch test which was fine, and first treatment, there was no problem, 6 weeks later she wanted them tinted again, but didn't tell me she had covid in between treatments, and had a allergic reaction this time. Thankfulky everything was OK, this was 2mths ago, she's now approached me to see if I would tint them again! I'm a nervous wreak at the thought of it, can anyone advise on what to do? If your allergic once will you alway be allergic or could this just of been an after affect from covid?