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Skin contact with arsenic can cause redness and swelling.

Other conditions noted in his medical history included a past Covid infection, rosacea, which is a skin condition often causing redness in the face, and a benign colon polyp.

Two days later the reaction arrived: redness, itching, oozing, crusting and small, fluid-filled blisters up and down his legs.

But importantly, this study notes that Mars' redness happened before the water left.

When the mystery of the LRDs first became apparent, professional and citizen scientists alike bandied about alternative theories for the LRDs’ redness, all of which is healthy for the state of scientific discourse.