A rash is an inflammatory response that causes changes to your skin, such as redness, itching, blistering, and scaly or raised skin patches.
Lymph nodes are part of your lymphatic system. They filter fluids in your body and return them to the circulation system for disposal, as well as house infection fighting cells. Lymph nodes can become swollen and tender when they’re active in fighting infections.
You typically can’t feel lymph nodes when you’re well, but swollen nodes feel soft and round, like a pea or bean beneath your skin. Some can feel hard.