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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Identifying a tick matters because different species carry different diseases. Tick ID comes from size, color, the markings on the back, and whether it is engorged with blood. A close photo helps name the species, like a deer tick versus a dog tick, which is the first clue to what illness, if any, it might transmit.
Below are the kinds of ticks people most often find on themselves, kids, and pets. Scan yours, then save the tick and watch for symptoms after any bite.
Common types of ticks
A quick reference to the ones people ask about most. Not sure which you have? Snap a photo above and let the AI name it.
Deer (blacklegged) tick
Small, dark-legged, with an orange-red body. The primary carrier of Lyme disease in much of the US.
American dog tick
Larger, brown with whitish markings on the back. Can transmit Rocky Mountain spotted fever.
Lone star tick
Brown with a single white dot on the female's back. Linked to STARI and the alpha-gal red-meat allergy.
Brown dog tick
Uniform reddish-brown, the one tick that can infest homes and kennels by completing its life cycle indoors.
Gulf Coast tick
Similar to the dog tick, found in the southern US, and a carrier of a spotted-fever group illness.
Engorged ticks
After feeding, ticks swell into a gray or olive balloon shape that hides their normal markings.
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.
Which ticks carry disease?
Species matters because each spreads different illnesses. Deer ticks carry Lyme disease, the lone star tick is linked to the alpha-gal meat allergy and STARI, and dog ticks can transmit Rocky Mountain spotted fever. If a tick was attached, save it in a sealed bag, note how long it was on, and watch for a rash, fever, or aches. See a doctor if symptoms appear, no app replaces medical advice after a bite.
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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