My Mother Whom Is A Senior Age 65 Has A

My mother whom is a senior age 65 has a swollen cheek on the right side of her face. She also has gunck coming out only when she lays down. It looked as,tho it was a stey the first 2_ days. Yesterday it wasn't to swollen but, today it is swollen again along with her cheek Along with making it hard for her to see.
Please help with the best diagnosis possible?