Identify Any Tick from a Photo
Tick species decides disease risk. The black-legged (deer) tick carries Lyme; the lone star tick carries alpha-gal syndrome and ehrlichiosis; the American dog tick carries Rocky Mountain spotted fever. Our AI tick identifier names the species from a photo, flags the diseases known to that vector in your region, and tells you the time window for prophylactic treatment.
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Why identifying ticks matters
Lyme prophylaxis is most effective within 72 hours of a tick bite, so accurate species ID in the first day matters a lot. A dog tick bite usually warrants watch-and-wait; a deer tick attached for 24+ hours often warrants a single-dose doxycycline. Knowing which tick you pulled off changes the next 24 hours, not next week.
What helps identify ticks
Body color and shape
Deer tick: tiny (poppy-seed sized nymph, sesame-seed adult), reddish-brown body with darker legs and shield. American dog tick: larger, brown with white or silver mottling on the shield. Lone star tick: a single white dot on the female's back is unmistakable.
Scutum (shield) pattern
The hard plate behind the head. Solid brown (deer tick), white-mottled (dog tick), or with bright spots (lone star) — the scutum is the most species-diagnostic feature.
Size and engorgement
An unfed deer tick nymph is barely larger than a sesame seed; engorged with blood it can swell to pencil-eraser size. Size alone is not a species clue — engorgement changes everything.
Region
Deer tick (Northeast, Upper Midwest), lone star (Southeast spreading north), American dog tick (East Coast), Rocky Mountain wood tick (western US). Region narrows possibilities before you even look at the bug.
Photo tips for the best identification
- 1Remove the tick with fine-tipped tweezers, pulling straight up without twisting. Save it in a sealed bag.
- 2Photograph the tick on a plain white surface (paper, tissue) at maximum macro zoom.
- 3Include a coin or ruler for scale.
- 4If attached, also photograph the bite site — a bullseye rash within 30 days is a clinical sign of Lyme.
Frequently asked questions
Should I get tested or treated after a tick bite?
Depends on species, attachment time, and region. Deer ticks attached >24 hours in a Lyme-endemic area often qualify for a single 200mg doxycycline dose. Call your doctor or local health line within 72 hours of removal — that is the window. Most dog tick and harmless species bites do not require treatment.
How do I tell a deer tick from a dog tick?
Size and shield. Deer ticks (Ixodes scapularis) are very small — adult females have a teardrop-shaped body, reddish-brown with a small black shield. Dog ticks (Dermacentor variabilis) are roughly twice the size with a marbled white-and-brown shield.
Can ticks be tested for Lyme?
Yes, but the result is generally not used to guide treatment — clinical guidelines treat based on the bite circumstances, not the tick. Some state labs and private services do test ticks. The result is useful for awareness but not a substitute for clinical follow-up.
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