Scabies has a few telltale signs you can look for at home: intense itching that gets worse at night, a pimple-like rash concentrated in skin folds, and thin, raised lines on the skin called burrows. These three features together are the strongest indicators, though a definitive diagnosis requires a healthcare provider to confirm the presence of mites or their eggs. Here’s how to systematically check yourself or someone else.
The Itch Pattern Is the First Clue
Scabies itching has a distinct signature. It’s intense, often described as relentless, and it gets noticeably worse at night. This nocturnal flare happens because the mites are more active in warm skin, and your body’s allergic response to the mites, their eggs, and their waste products ramps up while you sleep. If your itching is mild, comes and goes randomly throughout the day, or stays in one spot that looks dry and flaky, you’re more likely dealing with eczema or contact dermatitis.
Timing matters too. If this is your first exposure to scabies, symptoms can take four to six weeks to appear because your immune system needs time to develop a reaction. If you’ve had scabies before, symptoms can start within days of a new infestation. So if someone in your household was recently diagnosed and you don’t itch yet, that doesn’t rule it out.
Where to Look on the Body
Scabies mites prefer thin, folded skin. In adults, check these areas carefully:
- Between the fingers, especially the webbing
- Inner wrists and inner elbows
- Armpits
- Waistline and belt area
- Buttocks and knees
- Around the nipples and breasts
- Male genital area
- Shoulder blades
You’re looking for small red bumps, tiny blisters, or a pimple-like rash clustered in these zones. The rash doesn’t usually appear on the face, scalp, or neck in adults. If it does, that points more toward eczema or another condition.
Infants and very young children are different. Their rash commonly shows up on the head, face, neck, palms, and soles of the feet, areas that are rarely affected in adults. If a baby has an unexplained rash on the palms or soles along with fussiness (especially at night), scabies is worth considering.
How to Spot Burrows
Burrows are the most distinctive sign of scabies and the feature that sets it apart from other itchy skin conditions. They’re created by female mites tunneling just beneath the surface of the skin to lay eggs. They appear as tiny, raised, serpentine lines that are grayish or skin-colored and can be a centimeter or more in length. They look like faint, irregular scratches or thread-thin squiggles.
The best places to spot burrows are between the fingers, on the inner wrists, and along the sides of the hands. Use good lighting and a magnifying glass if you have one. Burrows can be hard to see on darker skin tones or if you’ve been scratching heavily, since broken skin and inflammation can obscure them.
The Ink Test
You can make burrows more visible at home using a simple technique. Rub a washable felt-tip pen or marker over an area where you suspect burrows. Then immediately wipe the ink off with an alcohol wipe or rubbing alcohol on a cotton pad. If a burrow is present, the ink seeps into the tunnel beneath the skin’s surface and stays there, revealing a distinctive zigzag line even after the surface ink is wiped away.
This method works best on fresh burrows within the first few days of symptoms appearing. On older, scratched-up skin, it’s less reliable. It’s a useful home check, but a negative result doesn’t rule out scabies.
How Scabies Looks Different From Eczema
Scabies and eczema can look similar at a glance, which is why scabies is frequently misdiagnosed. Here are the key differences:
Eczema produces dry, rough, or leathery patches of skin that may ooze or crust over. The affected skin is often scaly and discolored. It tends to appear in predictable spots like the insides of elbows and behind the knees, but it doesn’t produce burrow lines or pimple-like bumps in the same clustered pattern scabies does.
Scabies produces small, distinct bumps and blisters concentrated in skin folds, often in multiple body areas simultaneously. The itching is more severe and specifically worsens at night. The presence of burrows is the clearest differentiator: eczema never creates them. Another clue is household spread. If multiple people in the same home develop intense itching around the same time, scabies is far more likely than eczema.
What a Doctor Looks For
A healthcare provider can often diagnose scabies based on the rash pattern and your description of the itching alone. But when confirmation is needed, several tools are available.
Dermoscopy is the quickest method. A handheld magnifying device lets the provider look at the skin under high magnification. Mites appear as a small dark triangle at the end of a burrow, sometimes called the “delta wing jet” sign because it resembles a tiny airplane. This is often enough to confirm the diagnosis on the spot.
Skin scraping is the gold standard for definitive confirmation. The provider gently scrapes the end of a burrow with a blade or needle and examines the sample under a microscope, looking for mites, eggs, or waste. This is a quick, minimally uncomfortable procedure.
An adhesive tape test is another option: clear tape is pressed against a suspicious lesion, then transferred directly to a microscope slide. A skin biopsy is rarely needed but can reveal mites and eggs in cases where the diagnosis is uncertain.
The International Alliance for the Control of Scabies considers a case “confirmed” when mites, eggs, or mite waste are directly visualized, either under a microscope or through dermoscopy. A “clinical” diagnosis, based on visible burrows and a typical rash distribution, is considered reliable enough to begin treatment.
Crusted Scabies Looks Very Different
There’s a severe form called crusted scabies (previously known as Norwegian scabies) that looks nothing like typical scabies. Instead of scattered bumps and burrows, it produces thick, crusty, grayish plaques on the skin that may crack and fissure. The itch may actually be less intense than in regular scabies because this form most often affects people whose immune systems or nerve function are compromised.
People at highest risk include the elderly, those living with HIV/AIDS, and individuals with conditions that limit their ability to feel or scratch, such as spinal cord injuries or paralysis. Crusted scabies is also extremely contagious because the thick crusts harbor thousands of mites, compared to the 10 to 15 mites found in a typical case. If you notice thick, warty crusts on the hands, feet, or elbows of someone in a high-risk group, seek medical evaluation promptly.
Signs That Scratching Has Caused a Secondary Problem
Persistent scratching can break the skin and open the door to bacterial infections. Watch for skin that becomes increasingly red, swollen, warm to the touch, or painful rather than just itchy. Honey-colored crusting on top of the rash can signal impetigo, a common bacterial skin infection that develops when scratched scabies lesions get infected. Spreading redness or red streaks around a sore suggest the infection may be going deeper. These complications are treatable, but they need attention separate from the scabies itself.