Provided are methods, kits and arrays for use in determining whether a scar of interest is keloid or non-keloid in nature. These determine keloid or non-keloid nature based on comparison of gene expression in the scar of interest with expression in a control sample. If expression of at least one gene, selected from the group of genes set out in Table 1, is increased in a sample representative of gene expression in the scar of interest compared to expression of the same gene (or genes) in the control sample this indicates that the scar of interest comprises a keloid.