What does a tick under the armpit look like?

What does a tick under the armpit look like? - briefly

A tick situated in the under‑arm area looks like a tiny, round or oval insect, typically gray‑brown and about the size of a pinhead. After it feeds, it swells into a reddish‑brown or darkened, balloon‑like shape that may be partially visible through the skin.

What does a tick under the armpit look like? - in detail

A tick lodged in the armpit presents a distinct visual profile that changes as it feeds.

The unfed stage is typically 2–5 mm long, dome‑shaped, and reddish‑brown. Its back (scutum) is hard, smooth, and often darker than the abdomen. Six short legs extend from the front, each ending in tiny claws that grip skin. The mouthparts—chelicerae and hypostome—are not visible externally but lie beneath the body.

During engorgement the tick expands dramatically, reaching 10–15 mm or more. The abdomen swells into a balloon‑like, pale gray or whitish mass, while the scutum remains relatively unchanged, giving a “two‑tone” appearance. The enlarged body appears soft, translucent, and may appear glossy. The legs become less prominent as the body stretches, but they still protrude from the anterior edge.

Key visual indicators of attachment in the axillary region include:

  • A rounded or oval mass protruding from the skin, often flush with surrounding tissue.
  • A clear demarcation between the darker scutum and the lighter, engorged abdomen.
  • A small, dark puncture or hole at the center of the mass where the mouthparts have penetrated.
  • Possible redness or mild swelling around the attachment point, especially if the tick has been present for several hours.

Nymphal ticks are smaller (1–2 mm) and lighter in color, making them harder to detect. Adult females are the largest and most likely to cause noticeable swelling. Recognizing these characteristics enables prompt removal and reduces the risk of disease transmission.