Clothes moths are not dangerous to humans. They don’t bite, sting, or transmit diseases. The adults don’t even have functional mouthparts. The real damage is to your belongings: larvae can destroy wool sweaters, silk scarves, fur coats, and other natural-fiber items worth hundreds or thousands of dollars. And ironically, the most common way people try to fight clothes moths, using chemical mothballs, poses more health risk than the moths themselves.
Why Clothes Moths Can’t Harm You Physically
Adult clothes moths are small, golden-tan insects about half an inch long. They avoid light, don’t fly toward lamps like other moths, and tend to scurry into dark corners when disturbed. They have no ability to bite or pierce skin. They don’t carry bacteria or parasites that could make you sick. If one lands on you, the worst outcome is a mild startle.
The larvae, which are tiny cream-colored caterpillars, are equally harmless to your body. Their specialized digestive systems are built to break down keratin, a tough protein found in animal-based fibers. That’s what makes them destructive to your wardrobe but irrelevant as a health threat. They have no interest in human skin, food, or anything outside their narrow diet of wool, silk, fur, feathers, felt, and leather.
The Damage They Actually Cause
What clothes moths threaten is your property. Larvae chew irregular holes through natural-fiber fabrics, and they can work undetected for weeks or months in dark closets, storage bins, and dresser drawers. A single infestation can ruin irreplaceable heirlooms, expensive suits, cashmere blankets, and vintage textiles. The financial and sentimental cost can be significant.
Cotton and synthetic fabrics like polyester and rayon are rarely attacked unless they’re blended with wool or heavily soiled with food stains and body oils. Larvae are drawn to keratin-rich fibers, but sweat, skin oils, and food residue on any fabric can attract them. This is why worn clothing stored without washing is especially vulnerable.
Signs of an infestation include small holes in garments, silky webbing or tiny tubes on fabric surfaces, and sand-grain-sized droppings that match the color of the fiber being eaten. You might also spot the pale larvae themselves, which are usually less than half an inch long. The adult moths you see fluttering in your closet are actually the less destructive stage. By the time you notice them, their larvae may have already been feeding for some time.
Mothballs Are the Real Health Concern
The most genuinely dangerous thing about a clothes moth problem is how people often respond to it. Traditional mothballs contain either naphthalene or paradichlorobenzene, both of which are pesticides that work by releasing toxic vapor. When you smell mothballs, you are inhaling the pesticide.
Paradichlorobenzene exposure causes nausea, vomiting, dizziness, fatigue, and headaches. The vapor irritates eyes and nasal passages. Prolonged skin contact can produce a burning sensation. Inside the body, the chemical is distributed through blood, fat, and even breast milk, and is broken down into compounds that can harm the liver. The World Health Organization has classified paradichlorobenzene as possibly carcinogenic to humans based on animal studies, though the U.S. EPA considers it “not likely to be carcinogenic.”
Children and pets face the highest risk. Mothballs look like candy or treats, and ingestion can cause serious poisoning. In pets, eating a mothball can trigger vomiting, tremors, abdominal pain, and kidney or liver damage. Using mothballs in open spaces, poorly ventilated rooms, or anywhere children and animals can reach them creates a genuine health hazard that far exceeds anything the moths themselves could do.
Safer Ways to Eliminate Them
Heat and cold are the most effective non-chemical options. Laundering infested items for 20 to 30 minutes in water at least 120°F kills eggs, larvae, and adults. For delicate items that can’t be washed at high temperatures, sealing them in a plastic bag and placing them in a household freezer for several days also works. The key with freezing is sustained, uninterrupted cold, so avoid opening and closing the bag.
Regular vacuuming of closet floors, shelves, and baseboards removes larvae, eggs, and the hair and lint they feed on. Storing clean clothes in airtight containers or sealed garment bags prevents moths from reaching vulnerable fabrics in the first place. Cedar blocks and lavender sachets are popular natural deterrents, though their effectiveness fades as the scent dissipates and they work better as preventive measures than as treatments for active infestations.
Pheromone traps, which use a sticky surface laced with a scent that attracts male moths, can help you monitor whether you have an active problem. They won’t eliminate an infestation on their own, but a trap catching multiple moths over a few weeks tells you larvae are likely feeding somewhere nearby.
What’s Worth Worrying About
If you’ve spotted clothes moths in your home, your health is not at risk from the insects. Your wardrobe is. The urgency is about finding where larvae are feeding and stopping the damage before it spreads to more garments. Check stored wool items, fur, down-filled products, and anything made from silk or leather. Items that have been sitting undisturbed in dark spaces for months are the most likely targets.
The only health dimension worth taking seriously is chemical exposure. If you choose to use mothballs, follow label directions precisely, use them only in sealed containers (never scattered in open closets or rooms), and keep them away from children and pets. For most situations, heat treatment, cold treatment, and good storage practices handle the problem without introducing toxic chemicals into your living space.