What does a bite from a Lyme disease tick look like? - briefly
A Lyme‑carrying tick bite typically starts as a small, painless red papule that can develop into an expanding, concentric target‑shaped rash (erythema migrans) within 3–30 days. The rash often measures 5–30 cm, with a central clearing surrounded by a red ring, and may be the sole early indication of infection.
What does a bite from a Lyme disease tick look like? - in detail
A bite from the tick that transmits Lyme disease usually leaves a tiny puncture wound that may be invisible to the naked eye. The entry point often appears as a flat, red spot no larger than a pinhead and is frequently painless. In many cases the skin around the site shows no immediate reaction; the tick can remain attached for 24–48 hours without causing noticeable irritation.
If infection develops, the most recognizable sign is a slowly expanding erythema. This rash typically emerges 3–30 days after the bite and presents as a round, red area that enlarges to a diameter of 5–30 cm. The center frequently clears, producing a concentric “target” or “bull’s‑eye” pattern, although a uniform red patch without central clearing is also common. The lesion may feel warm, but it is not usually itchy or painful.
Additional visual cues may include:
- A small, raised bump (papule) at the attachment site.
- A faint halo of redness surrounding the central puncture.
- A scab or crust forming over the puncture after the tick detaches.
- In rare cases, vesicles or blisters within the expanding rash.
The bite location often involves concealed areas such as the scalp, behind the ears, under the arms, the groin, or the back of the knees, making early detection difficult. An engorged tick may be visible on the skin, appearing dark and swollen; removal should be prompt to reduce transmission risk.
Absence of a rash does not rule out infection. Laboratory testing and clinical evaluation are required when a bite is known or suspected, especially in regions where the vector is endemic.