Composition containing at least one aminophenol derivative and a solubilizing compound which is not in the form of vesicles, chosen from: (a) oxyalkylenated fatty acid esters of sorbitan, (b) oxyalkylenated hydrogenated castor oils, and/or (c) oxyalkylenated fatty alcohols. The invention also relates to a process for dissolving at least one aminophenol derivative by mixing it with a solubilizing agent as defined above.