In simple linear regression a single independent variable is used to predict the value of a dependent variable. In multiple linear regression two or more independent variables are used to predict the value of a dependent variable. The difference between the two is the number of independent variables.
Watching for Systemic Symptoms. 1  1. Watch from swollen glands. Serious cases of cellulitis will spread beyond the initially infected region to become systemic and impact the rest of the body. 2  2. Notice if you experience fever and/or chills.
Cellulitis is an infection of the deeper layers of skin and the underlying tissue. It can be serious if not treated promptly. The infection develops suddenly and can spread through the body quickly. Severe infections can spread deep into the body, and can be life threatening.