A sore throat can look very different depending on what’s causing it. A mild viral sore throat typically appears as a red, slightly swollen back of the throat with no other major changes. But white patches, tiny red dots on the roof of the mouth, blisters, or bumpy textures each point to something more specific. Knowing what you’re looking at can help you figure out whether you’re dealing with a common cold, a bacterial infection, or something else entirely.
A Normal Throat vs. an Irritated One
A healthy throat is pink and smooth. The tonsils (the two oval pads on either side of the back of your throat) sit flat or slightly raised without any coating. The uvula, the small tissue hanging down in the center, points straight down.
When a sore throat develops, the first visible change is redness. The back wall of the throat, the tonsils, and the surrounding tissue become noticeably darker pink or red, and you may see mild swelling. With a standard viral sore throat from a cold or flu, that’s often all you’ll see. The redness is diffuse, there’s no coating or spots, and the tonsils may be slightly puffy but not dramatically enlarged.
White Patches or Spots on the Tonsils
White or yellowish material on the tonsils is one of the most recognizable signs of a more significant infection. What the patches look like tells you a lot about the cause.
In strep throat, the tonsils are swollen and red with speckled white or yellowish dots of pus scattered across their surface. These spots tend to be small and distinct rather than forming one continuous sheet. Strep also commonly causes tiny red dots (called petechiae) on the roof of the mouth, which is a finding significant enough that some clinicians consider it an important clue alongside the other classic signs: fever over 100.4°F, swollen tonsils, tender lymph nodes in the neck, and the absence of a cough.
Mononucleosis (mono) looks different. The tonsils become very swollen and are typically covered with a thicker, more extensive whitish coating that can appear shaggy or membrane-like, sometimes spreading beyond the tonsils. This coating tends to be more grey-white than the bright yellow-white of strep. Mono can also cause those same tiny red spots on the palate, so the spots alone aren’t enough to distinguish between the two.
Oral thrush, a fungal infection, produces creamy white patches that look like cottage cheese. These patches appear not just on the tonsils but also on the tongue, inner cheeks, and roof of the mouth. A key difference: if you gently scrape a thrush patch, it comes off and may leave a slightly bleeding surface underneath. Bacterial exudate on tonsils doesn’t wipe away the same way.
Bumps on the Back of the Throat
If the back of your throat looks like it’s covered in small, rounded bumps resembling cobblestones or pebbles, you’re likely looking at cobblestone throat. These bumps are fluid-filled tissue that forms when the tonsils and adenoids become irritated. They can look red, swollen, or slightly discolored.
The most common cause is postnasal drip. Mucus thickens and drips down the back of the throat, irritating the tissue over time. Allergies, acid reflux, and chronic sinus infections all trigger this pattern. Cobblestone throat looks alarming but is generally a sign of ongoing irritation rather than a serious infection. The bumps are temporary and resolve once the underlying irritation stops.
Blisters or Small Ulcers
Small blisters or open sores in the throat point to a viral infection, most commonly herpangina. This condition causes tiny lesions, usually smaller than 5 millimeters, concentrated on the soft palate, tonsils, and back wall of the throat. The lesions start as small red spots, develop into fluid-filled blisters, and then break open into shallow ulcers with a red border. They’re painful, especially when swallowing.
Herpangina is most common in children and typically comes with a sudden fever. It’s caused by the same family of viruses responsible for hand, foot, and mouth disease. A related variant causes small nodular bumps in the same locations, but these don’t blister or ulcerate.
Swelling That Looks Uneven
When one side of the throat is noticeably more swollen than the other, that’s a red flag. The classic sign of a peritonsillar abscess is one tonsil pushing inward and downward while the uvula shifts toward the opposite side. This asymmetry is distinct from the even, bilateral swelling you see with regular tonsillitis or strep.
A peritonsillar abscess usually develops as a complication of untreated or worsening tonsillitis. The voice often sounds muffled, opening the mouth becomes difficult, and the pain is significantly worse on one side. This is a situation that needs prompt medical attention because the abscess won’t resolve on its own.
How to Tell Viral From Bacterial by Appearance
No single visual feature guarantees a diagnosis, but a few patterns are reliable enough to guide your thinking. Viral sore throats tend to come with other cold symptoms: runny nose, cough, hoarseness, and sometimes conjunctivitis. The throat looks red and irritated but usually lacks the white exudate you see with bacterial infections.
Bacterial infections, particularly strep, are more likely when you see distinct pus spots on swollen tonsils, tiny red dots on the palate, swollen lymph nodes you can feel under the jaw, and a fever, all without a cough. The combination matters more than any single sign. A scoring system used by clinicians assigns one point each for tonsillar swelling or exudate, tender neck lymph nodes, fever over 100.4°F, and absence of cough. The more points, the higher the likelihood of strep, though a throat swab is the only way to confirm it.
One visual distinction worth remembering: strep tends to produce speckled, dotted coatings on the tonsils, while mono and other infections more often cause extensive, spreading coatings that cover larger areas of the tonsillar surface.
What Color Changes Mean
The color of the throat and any coating on it gives useful clues. Bright red, angry-looking tissue suggests active inflammation, whether viral or bacterial. A deeper, dusky red may indicate more severe swelling or an abscess forming. White or yellow spots on the tonsils point to pus from a bacterial infection or, less commonly, from a viral infection like mono. Grey-white membranes suggest mono or, rarely, other infections. Creamy white patches that spread across the tongue and cheeks suggest fungal overgrowth.
Redness on the soft palate with scattered tiny red dots is particularly worth noting. These pinpoint hemorrhages are strongly associated with strep throat and mono, and most people wouldn’t think to look at the roof of the mouth. If you’re trying to assess a sore throat at home, tilt your head back under good light and check not just the tonsils but the entire soft palate.