Claim: Lyme disease's most common sign of infection is a rash.
Evidence: The most common sign of infection is an expanding area of redness on the skin , known as erythema migrans , that begins at the site of a tick bite about a week after it has occurred.
Erythema chronicum migrans -LRB- New Latin , literally , `` chronic migrating redness '' -RRB- refers to the rash often -LRB- though not always -RRB- seen in the early stage of Lyme disease.