Before the onset of arthritis, some of the children had developed strange circular rashes where they had been bitten by ticks. Lyme disease has since become the most common tick-borne infection in ...

Medically reviewed by Jurairat J. Molina, MD A circular rash is commonly caused by a fungal infection called ringworm.

A common symptom of Lyme disease is a bullseye-shaped rash. However, many other conditions may cause a similar rash, including ringworm, fixed drug reactions, and allergic reactions to insect bites.

Spider mites appear as rashes caused by issues with the skin ... a rash with a great ability to spread through the skin, is a hallmark of Lyme disease, a serious bacterial disease.