The authors report a case of cutaneous Larva migrans attributed to a gnathostomiasis in a Laotian man living in France since 3 years. The diagnosis was suggested on the basis of epidemiological and clinical context (he often ate raw fresh fish in Thailand) and blood eosinophilia. It was confirmed by ELISA method which showed a very high antibody titer to Gnathostoma spinigerum. The patient was treated with cortisone and diethylcarbamazine and he has remained asymptomatic since.