Patent ID: 6884424

Claim:
A method for preventing actinic keratosis comprising applying to the affected skin surface an amount of a composition effective for preventing actinic keratosis, said composition comprising a hydroximic acid derivative of the formula wherein R 1 is a hydrogen atom or a C 1-5 alkyl group; R 2 is a hydrogen atom or a C 1-5 alkyl group, a C 3-8 cycloalkyl group or a phenyl group, optionally substituted by a hydroxy group or a phenyl group; or R 1 and R 2 together with the nitrogen atom to which they are attached form a 5 to 8 membered saturated or unsaturated ring that optionally comprises one or more further nitrogen or oxygen atoms, wherein said ring can be optionally condensed with a benzene ring; R 3 is a hydrogen atom, a phenyl group, a naphthyl group or a pyridyl group wherein said groups can optionally be substituted by one or more halo atoms or C 1-4 alkoxy groups; A is a group of the formula wherein R 4 is a hydrogen atom or a phenyl group; R 5 is a hydrogen atom or a phenyl group; m has a value of 0, 1 or 2; and n has a value of 0, 1 or 2; or a physiologically acceptable acid addition salt thereof as the active ingredient.