Hello, Thank you for asking at HCM. I went through your history and would like to know more about you as follows: a. In past, have you ever had such hives? b. How your allergies to insects and cephalexin were diagnosed? c. Do you have any other complaints along with hives, like respiratory complaints, nose complaints, stomach complaints, etc? d. Do you have any repeated digestive complaints? e. Do you have any other medical conditions? f. Do you need to take any other medications frequently/repeatedly? Above information would help me to understand your complaints better and therefore to make suggestions more specifically. However, at present, I would like to make suggestions for you as follows: 1. I usually suggest my such patients taking regular antihistamines like cetirizine/levocetirizine in morning and hydroxyzine in evening for 1-2 weeks depending upon response. 2. I would also suggest you to apply calamine lotion over the itchy areas/rash. 3. Please do not scratch the itchy areas as it would aggravate itching. 4. To identify/suspect the cause, in addition to above asked details, some investigations such as complete blood counts, ESR, stool examination, urine examination, etc would also help. Hope above suggestions will be helpful to you. Should you have any further query, please feel free to ask at HCM. Wish you a very good recovery and the best of the health ahead. Thank you & Regards.