FLARE diagnostics detectors have also been used to measure erythema associated with allergen skin testing. In the image displayed here, skin prick testing was placed using both positive histamine (Pos) and negative control saline (Neg). Images of the erythematous region is clearly visible as a flare pattern surround the positive control area but not the negative control area. There is a minor signal detected in the region of a blood vessel in the wrist.