Moths don’t actually bite your clothes. The damage you’re seeing, those irregular holes and threadbare patches, is caused by moth larvae feeding on the fabric. Adult clothes moths have no functional mouthparts and never eat. It’s the tiny, creamy-white caterpillars (up to half an inch long) that do all the damage, quietly chewing through fibers while hidden in folds, dark corners, and undisturbed areas of your closet.
Why Larvae Eat Your Clothes
Clothes moth larvae can digest keratin, a tough protein found in animal-based fibers like wool, silk, cashmere, fur, and feathers. This is the same protein that makes up human hair and nails, and very few organisms can break it down. The larvae target these natural fibers specifically because keratin is their food source.
Synthetic fabrics like polyester and nylon aren’t nutritious to the larvae on their own. However, clothing made from blends or synthetics can still be damaged if the fabric is soiled with sweat, food stains, or body oils. Those organic residues give larvae enough nutrition to chew through fibers they’d otherwise ignore. This is why worn, unwashed clothing left sitting in a closet is especially vulnerable.
What Moth Damage Looks Like
The two common species leave slightly different evidence behind. Webbing clothes moths spin silken tubes and patches of webbing across the surface of infested fabric. As the larvae graze along the surface, they remove fibers at the base, creating threadbare spots rather than clean-cut holes. You may notice a fine, web-like residue on the fabric surface.
Casemaking clothes moths are easier to identify. Their larvae build small, open-ended tubular cases out of silk and bits of the fabric they’re eating. These tiny portable shelters, often matching the color of the garment, get dragged along as the larva moves and feeds. If you spot what looks like a small grain of rice made of fabric fibers clinging to your clothing, that’s a casemaking moth larva at work.
Moth Damage vs. Carpet Beetle Damage
Carpet beetle larvae also destroy natural-fiber clothing, and the two infestations are often confused. The key difference is silk. Clothes moth larvae leave behind webbing or cases, while carpet beetle larvae (which are covered in tiny hairs or bristles) leave no silk at all. Instead, you’ll find small, round fecal pellets near the feeding site. Carpet beetle larvae are also smaller, roughly an eighth to a quarter inch long, compared to the half-inch clothes moth caterpillars.
Can Moths Cause Skin Reactions?
Some people searching for “moth bites” are actually wondering about itchy bumps on their skin. Clothes moths themselves don’t bite people, but certain caterpillar and moth species have defensive hairs or spines that can cause skin irritation on contact. These reactions range from small red bumps that clear within an hour to itchy, scaly, or blistering rashes that persist for weeks. The irritating hairs can even detach and drift through the air, triggering reactions without direct contact with the insect.
These skin reactions are easily mistaken for insect bites, allergic reactions, or other skin conditions because the clinical features overlap so much. If you’re finding mysterious itchy bumps alongside damaged clothing, the clothing damage is almost certainly from larvae, but the skin irritation could be a coincidental and unrelated issue.
How to Kill Moth Larvae in Clothing
Three temperature-based methods reliably kill clothes moths at every life stage, including eggs:
- Hot water laundering: Wash infested items for 20 to 30 minutes in water at least 120°F. This is the most effective option for anything machine-washable.
- Heat treatment: Place items in an oven at temperatures above 120°F for at least 30 minutes. This works for items that can’t be submerged in water.
- Freezing: Seal the item in a plastic bag and place it in a freezer set below 18°F for several days. This is a good option for delicate items like fur, silk, or vintage textiles that can’t tolerate heat or water.
For garments already showing threadbare spots or holes, killing the larvae stops further damage but won’t repair what’s already been eaten. Catching an infestation early makes a real difference.
Preventing Moth Damage
The single most effective thing you can do is clean clothing before storing it. Larvae are drawn to soiled garments, so washing or dry cleaning items before they go into long-term storage removes the food residues and body oils that attract moths in the first place.
Airtight storage is the next line of defense. Sealed plastic bins, vacuum-sealed bags, or zippered garment bags physically prevent adult moths from reaching your clothes to lay eggs. Moths can’t chew through plastic, so anything properly sealed is safe regardless of what it’s made from.
Cedar is a popular natural deterrent, and cedar blocks, rings, and planks are widely sold for closet use. The aromatic oils in fresh cedar can repel adult moths and may kill very young larvae, but the effect fades as the wood dries out. Sanding the surface or using a cedar-restoring spray periodically refreshes the scent. Cedar works best as a supplement to cleaning and sealed storage, not as a standalone solution. Lavender sachets function similarly, offering a mild repellent effect that won’t eliminate an active infestation.
Regular vacuuming of closet floors, shelves, and baseboards removes stray eggs and larvae before they can establish themselves. Pay special attention to corners, cracks, and areas beneath stored clothing where debris accumulates. Moths thrive in undisturbed spaces, so simply rotating and inspecting your stored garments every few months can catch a problem before it spreads.