Suppose we got a mosquito bite at night, if we scratch the place were the mosquito bit us it becomes big, But But I the morning mark disappears. Why?

Dear student, there is no as such explaination about why does the mark disappear in morning. It may be because it was just a small bite or small scratch. Usually these bites heal themselves when left untouched because of the development of new skin on the body parts like arms, legs etc. Thanks and regards