Hello As you mentioned that there is rashes over lower legs and arms and responded to alergica 125 & lotion. Reappears , so the reasons of these rashes may be , these includes. 1 Urticaria , mostly this is due to antigen antibody reactions and at once appear either all over body or some parts . This type of urticaria may be due to allergy . Allergen maybe mold , dust , pollen , hay , some drugs .Get in allergy test for confirmation. 2 Eiosinophilia may be the another cause of such symptoms so get in blood examination for total eiosinophils count. 3 Worm infestation may be the another such cause of such rashes . Get in blood as well stool examination . As there are so many reasons of such symptoms but when patients visit I usually prescribe them monteleukast+ fexofenadine tablet once or twice in day till complete relief. Also advise them to take albendazole+ ivermectine tablet 2 tablet stat for worm infestation. Some local calamine type lotion. Hope this information will help you.