The present invention provides at least any one of a novel evaluation method, a selection method, an evaluation support tool and a screening method for a scalp and/or hair. The evaluation method, the selection method, the evaluation support tool and the screening method are employed for evaluation of at least any one of scalp redness, an index related to the redness, a largeness in number of gray hairs, a smallness in number of hairs and a largeness of variation in hair thickness of an evaluatee based on information on bacteria of the genus Corynebacterium present in a scalp flora of the evaluatee, for evaluation of information on bacteria of the genus Corynebacterium present in a scalp flora of an evaluatee based on at least any one of scalp redness, an index related to the redness, a largeness in number of gray hairs, a smallness in number of hairs and a largeness of variation in hair thickness of the evaluatee, or for evaluation of at least any one of a largeness in number of gray hairs, a smallness in number of hairs, a largeness of variation in hair thickness and a thin hair ratio according to scalp redness or an index related to the redness of an evaluatee.
