Iam A Female 23 Yrs Old. For The Past Few

Iam a female 23 yrs old. For the past few months I get itches over my body and becomes red. Certain times without itching itself my skin becomes red in certain places. Though tat redness changes after a while I want to know why it happens. My doctor prescribed to take MONTAIR-LC tablet for six months. Does it help to get rid of this skin problem