Red dots 1 to 3 mm across that stay red when you press them are petechiae, and they mean small vessels are leaking or platelets have fallen below roughly 50,000 per microliter. Book a same-day appointment inside 12 hours of the first cluster. If the dots come with spotted gums, a temperature over 39.5 C, a nosebleed, or blood in urine or stool, the line shrinks to 2 hours; if the cat is collapsed, it is 0.
Most owners find petechiae by accident while brushing or clipping, which is useful, because a cluster of 10 dots found on day 1 is a very different problem from 200 dots found on day 4. The 4 checks below take 10 minutes and decide the next 12 hours.
The 4 checks, in this order
Press test first, then distribution, then size, then the whole cat. The order matters: if the dots blanch white, the rest of the sequence changes completely and you are probably looking at hives or flea dirt rather than a bleeding problem.
Check 1: the press test
Press a clear glass or plastic card over 5 dots for 5 seconds. Petechiae stay red because blood has already left the vessel; hives and normal flushing blanch white and refill in 1 to 2 seconds. Do it in daylight rather than under a warm lamp, and photograph the same 5 dots with a coin beside them for scale. Repeat at the same distance at the 12-hour recheck, because going from 10 dots to 30 dots matters more than the absolute count.
Check 2: the 4 sites that matter
Look at the ear pinnae on both sides, the gums above the canine teeth, the lower eyelids, and the belly where fur is thin. A cluster on the pinnae plus the gums is the pattern that fits a low platelet count; dots only on the belly often fit flea dirt or a contact reaction. Wet a white paper towel and rub 3 dots: a red-brown smear means digested blood from fleas, and those dots were never petechiae.
Check 3: size separates 5 different things
| Finding | Size (mm) | Blanches on press | Platelets (per uL) | Act within |
|---|---|---|---|---|
| Petechiae | 1-3 | No | 20,000-80,000 | 12 h |
| Purpura | 3-10 | No | 10,000-50,000 | 6 h |
| Bruise | 10-50 | No | under 20,000 | 2 h |
| Flea dirt | 0.5-1 | No, smears red | normal | 24-48 h |
| Hives | 5-20 | Yes | normal | none |
The platelet column is an estimate, not a result, and it is there to show why the same dot size changes the clock. A cat with 80,000 platelets rarely bleeds; below 20,000 it can bleed into the brain from a bump on the table.
Check 4: the 6 systemic signs
Temperature over 39.5 C or under 37.5 C, gum colour other than salmon pink, a nosebleed lasting more than 5 minutes, blood in urine, black stool, and swelling in 1 joint. Two or more of those 6 turn a 12-hour problem into a 2-hour problem. Fever plus petechiae is the pattern for sepsis or a tick-borne infection, and both are treated in hours rather than days.
4 causes worth ruling out
Immune-mediated thrombocytopenia, where the body clears its own platelets over 1 to 3 days and the count can fall from 120,000 to 8,000 inside a week. Retroviral infection, FeLV or FIV, which suppresses marrow production over weeks. Sepsis or disseminated intravascular coagulation, where platelets drop 30 to 50 percent in 12 hours. Toxins and drugs, including rodenticide, zinc, and any human painkiller given in the last 7 days. Vasculitis after a vaccine or infection is the fifth and usually shows on ear tips and paw pads; the zinc exposure page covers the ingestion side of that list.
What not to do in the next 12 hours
- No human painkiller or cold remedy, at any dose.
- No flea spot-on on broken skin and no bath; both add absorption and stress.
- No brushing, no nail trim, no scruffing. A cat under 20,000 platelets can bleed under the skin from a firm grip.
- No vaccines, dental work or elective surgery until a platelet count is back.
- Do not wait for the dots to spread before calling. One cluster on 1 ear is enough.
What 1 blood sample answers
A CBC with a manual platelet estimate, not only the analyzer number, because clumped platelets read falsely low in about 1 in 5 samples. A smear review for platelet size and red cell fragments. A retest at 4 hours if the count is under 50,000. A coagulation panel if there is bruising. Most in-house analyzers return a count in 20 to 40 minutes, which is fast enough to decide on treatment the same visit.
The 12-hour and 48-hour rechecks
Photograph the same 5 dots at 12 hours: fewer dots and a rising count means the cause was transient. New dots on a second site, a nosebleed, or black stool at any point means go back the same day. Recheck the count at 48 hours even if the cat looks normal, because immune-mediated cases rebound in 3 to 7 days and a count that falls again on day 5 needs a different plan. If the cat came home with a drip or a catheter, the aftercare routine applies on top of these checks.
5 steps now
- Press 5 dots with clear plastic for 5 seconds and photograph them beside a coin.
- Map the dots on 4 sites and write the count for each site.
- Take the temperature with a digital thermometer, and time any nosebleed.
- Stop every human drug and every new supplement, and write down what was given.
- Call and use the word petechiae, then ask whether a platelet count can be run today.
Terms mentioned in this article
Frequently asked
Can petechiae go away on their own?
Sometimes, when the cause was a transient infection or a drug that has been stopped, and the count climbs back over 3 to 7 days. The count still has to be measured twice, at 12 and 48 hours, because a cat with 8,000 platelets can look normal and bleed into the brain after a fall from the counter.
How do I tell petechiae from flea dirt?
Wet a white paper towel and rub 3 dots. Flea dirt is digested blood, so it smears red-brown and dissolves; petechiae are under the skin and do not smear at all. Flea dirt also sits on the hair surface and moves when you part the coat, while petechiae move with the skin.
Is a platelet count of 90,000 dangerous?
It is low but usually not dangerous on its own; spontaneous bleeding mostly starts under 30,000 and gets serious under 10,000. A count of 90,000 with dots on 2 sites still needs a 12-hour visit and a 48-hour recheck, because the trend over 3 days predicts the risk better than a single number.