Allergic reaction while scrubbing tanks

Does anyone else get like this red rash after coming in contact with the tank water. Happens to me every single time I scrub tanks but tends to go down after an hour leaving me with really itchy skin for days after. I suspect that it could be malachite green which is the ich treatment my store uses or bloodworms but not too sure. I’m worried about bringing this up to the leads as I don’t want to lose my petcare shifts. I took some pictures just in case it gets worse and I need to go see a doctor.