Heat rash usually appears in skin folds or on areas of skin where sweat accumulates, such as the armpits, chest, back, arms, and groin. People who live in hot climates, sweat a lot, or are on ...

You may develop a rash three to 30 days after the tick bite (seven days on average). A rash isn't always the sign of a tick-borne illness. Some people develop an allergic reaction to the bite, and ...