How can one tell when a tick is embedding?

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How can one tell when a tick is embedding? - briefly
Embedding is indicated by the tick’s mouthparts being sunk into the skin, often visible as a tiny dark spot that stays attached when the tick is lifted. A feeding lesion or a firmly anchored body confirms that the tick has begun to feed.

How can one tell when a tick is embedding? - in detail
Ticks attach by inserting their mouthparts into the skin. The moment the hypostome penetrates, the insect begins to feed and the host can observe several reliable indicators.
Visible signs on the skin include:

A small, raised bump at the attachment site, often resembling a tiny welt.
A dark, elongated shape protruding from the skin, sometimes described as a “blackhead” or “brownish” spot.
A clear or slightly amber halo surrounding the central point, indicating inflammation.

Changes in the tick itself are equally informative:

The body swells markedly, expanding up to three times its original size as it fills with blood.
The abdomen becomes visibly engorged, taking on a rounded, balloon‑like appearance.
The legs may appear less active, as the insect remains anchored in place.

Additional cues that the parasite is actively feeding:

The host feels a persistent, mild itching or tingling at the site, distinct from a fleeting bite sensation.
The area may develop slight redness that does not fade within a few hours.
If the tick is examined with a magnifier, the mouthparts are clearly embedded, and the tick’s claws are clamped tightly around the skin.

Timing is critical. Within the first 24 hours, the tick’s mouthparts are firmly fixed, and the abdomen begins to enlarge. After 48–72 hours, the engorgement becomes pronounced, and the risk of pathogen transmission rises sharply.
If any of the above signs are present, remove the tick promptly with fine‑point tweezers, grasping as close to the skin as possible and pulling straight upward. After removal, clean the area with antiseptic and monitor for rash, fever, or flu‑like symptoms. Persistent or worsening signs warrant medical evaluation.