Hi Bridget,
I read your message about the small red lesion and wanted to share my experience. I wanted to let you know about an autoimmune disease I have called Morphea, a localized scleroderma. It first appeared as a faint red rash about the size of a quarter on one shin & eventually on the other several months later. Over the next year, the faint red become brighter and then looked like a bruise. It did not hurt, itch or burn. I knew I had not caused the bruising. After it began to spread toward my knees, my concern became greater, I pointed it out to my primary care physician who sent me to a dermatologist who monitored the 'rashes' for the next few months. He biopsied the middle of this rash on one shin and the pathology report showed the Morphea. This dermatologist continued to tell me I was 'a very lucky gal' as the only other patients (3 total) he treated for Morphea also had an underlying disease. Fast forward 5 years since that diagnosis.....my lymphoma was diagnosed in 2015. All oncologists with whom I have met believe the lymphoma existed for several years before the diagnosis was made. My intent is to not scare you, but definitely have your primary care doctor and oncologist take a look at the rash. If they don't think it is a big deal, you may still want to have a dermatologist check it. I hope it clears up and disappears for you.