Sounds like rosacea - go to your dermatologist to make sure! They could prescribe you some kind of topical treatment to reduce redness.

basically i am 15 years old im taking cetirizine hydrochloride 10 mg tablets because i had a rash a very bad one that attaked the whole of my body apart from legs back and face miostly and it lasted for about 45 mins i gt it if i exercised the tablets have worked verywell the rashes do not come up anymore but i still get the redness and its all over my face it geos really red and only on my face is there anything i can do to reduse this thanks