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Table 1 Erythema and oedema scores used to determine the primary irritation index

From: Evaluation of the wound healing property of Commiphora guidottii Chiov. ex. Guid.

Erythema Value
No erythema 0
Very slight erythema (barely perceptible) 1
Well-defined erythema 2
Moderate to severe erythema 3
Severe erythema (beef redness) 4
Oedema formation Value
No oedema 0
Very slight oedema (barely perceptible) 1
Slight oedema (edges of area well-defined by definite raising) 2
Moderate oedema (raised approximately 1 mm) 3
Severe oedema (extending beyond the area of exposure) 4