Red Face Randomly

I’m a white female, 28. When I drink alcohol, (beer, tequila, ciders, wine, rum, anything) typically my face is fine. Sometimes my face with turn bright red and I get really hot. Last night I had a sour beer and my face turned red, I waited about 25-30 mousers and ate, then I drank more of it and I was fine. Why does this happen only randomly?