Fig. 1

Skin lesions in papular urticaria. a Crops of erythematous papules induced by flea bites in a patient living in Bogotá, Colombia. b Hyperchromatic residual pigmentations in legs after resolution of mosquito bite-induced papules in a patient from Cartagena, Colombia. Covered body areas (i.e. trunk and back) are more prone to flea bites. Mosquito bites predominate in exposed areas, such as legs, arms and neck