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Sorry this happened, and thanks for the photos!In Cozumel, I came up with red splotches on my thigh that found upon removing my wetsuit. I didn't feel much during the dive, though. I was wearing a full 5mm wetsuit. The only thing seeming reasonable was fire coral. There was a lot of it where we were. After looking at my wet suit there was a fine abrasion on its surface right in the area. Days later, still dealing with itching and dermatitis. So, I believe it can penetrate. I'm so glad I had the suit on, otherwise it would have been much, much worse.