Hello Thanks for posting your query. From your description it seems that your daughter its getting urticaria. Its a condition where there are red raised lesions on the body. There can be linear lessons like how you describe and is known as dermatographism. The second possibility is a viral infection or a drug induced rash. I would recommend that you visit your dermatologist and let him have a look and give his opinion. The best treatment for urticaria would be taking anti allergic medications like hydroxyzine. The dose depends on the weight of the child and you would require a prescription for it. Application of calamine lotion will be soothing. take care.