Figure 1: Preparation of Supplies and Subject.

Reagents needed for blistering procedure (A). Electronic Diversities Negative Pressure Instrument Model NP-4 with one chamber (B). Chamber head securely attached onto subject’s arm with provided velcro (C). Abdominal suction blister sites with chamber head securely attached with paper tape, blister site immediately after removal of chamber heads, and 1 year post blistering (D).