<s>[INST] Hi, I have been bitten by either mosquito or some type of bug behind my thigh just from sitting outside. The day the bits are still itchy and if I scratch them, they become all red and the itch it terrible. Can you tell me why they are still there the next day or two?  Thank you. [/INST] We are looking at either mosquito or bed bug bites. Yes bed bugs also are in public places like chairs, sofas or bus seats. You can wash the area with soap and water as the alkalinity in soap will reduce the itching. Also applying calamine lotion to the area would help . You can take a cetrizine tablet too just once a day to reduce itchiness for 3 days.Thank you for your query. </s>