18 months ago I had cellulitis in my chin. Unknown at the time I also had sll/cll. Is there any cause/ effect or other relationship between the two?

CLL have infections. Patients with cll have abnormalities of their immune system or healthy white blood cells that result in patients having a propensity to develop infections. These patients could have a deficiency in immune globulin, or antibody production or inadequate numbers of neutrophils. Common infections include sinusitis, pneumonias, urinary tract infections and cellulitis.
Immunity. If the immune status is down, infection rate can increase.