Why Does My Face Swell And Become Puffy, Especially After Shaving Or Riding A Bike, Despite Taking Antihistamines?

hello..my face swells and puffy always specially after shave. i tried everything to shave but still my face swells after shave and it is generally swells and puffy everytime if i go out and riding a bike. i have taken lot of antihistamine but not releived and done lots of test and nothing came out…please tell me what is this as i want lean face