Provided are methods, kits and arrays for use in determining susceptibility to keloid formation. These determine susceptibility based on comparison of gene expression in a patient 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 patient compared to expression of the same gene (or genes) in the control sample this is indicative of a susceptibility to keloid formation.