Silhouettes of a brown tick on the left and a white mosquito centered on a dark green circle on the right, against a light background.

Your Guide to Mosquito & Tick Defense: DEET vs. Picaridin vs. Permethrin

Nothing ruins a Minnesota summer picnic faster than a swarm of mosquitoes—or the surprise of a hidden tick. Between our state’s “favorite” biters and tick-rich woodlands, Minnesotans face a real battle every year. If you’re tired of dousing yourself in mystery sprays or worried about chemicals on your skin, you’re not alone. In this guide, you’ll learn the differences between DEET, picaridin, and permethrin, so you can confidently choose the right protection for your skin and your gear—and still enjoy the great outdoors.

How Insect Repellents Work

Most skin-applied repellents, including DEET and picaridin, don’t kill bugs—they deter them. Mosquitoes and ticks sense us through cues like scent, breath, and body heat; repellents interfere with those signals so insects have a harder time finding and biting you.

Permethrin, by contrast, is a contact insecticide used on clothing and gear. When insects land on treated fabric, they may be repelled, disabled, or killed. That’s why permethrin is for clothing, shoes, socks, tents, and outdoor gear—not for direct application to skin.

DEET: The Long-Standing Classic

How it works: DEET interferes with insects’ ability to detect and home in on people.

Strength & duration:
- 10% → about 1–2 hours of protection
- 20–30% → often about 4–8 hours, depending on the product, conditions, and insect exposure
Pros:
- Long track record of use
- Proven protection against mosquitoes and ticks
- Generally considered safe for children and pregnant or breastfeeding women when used as directed
Cons:
- Can feel oily and has a distinct odor
- May damage plastics, synthetic fabrics, watches, and gear
- Rare cases of skin irritation
Pro tip: Apply a thin, even layer only to exposed skin. Do not spray on cuts, irritated skin, hands of young children, or near the eyes or mouth. Wash treated skin with soap and water once indoors.

Picaridin: The Gentle Alternative

How it works: Picaridin works similarly to DEET by making it harder for mosquitoes and ticks to locate you.

Strength & duration:
- 10% → often about 4–6 hours
- 20% → often about 8–12 hours
Pros:
- Low odor, non-greasy, and colorless
- Does not damage plastics or fabrics the way DEET can
- Often preferred by people who dislike the feel or smell of DEET
Cons:
- Still needs to be reapplied as directed, especially with sweating, swimming, or heavy bug exposure
- Does not treat clothing long-term like permethrin
- Rarely, can still cause skin irritation
Pro tip: Apply a thin, even layer to exposed skin. Avoid eyes, mouth, cuts, and irritated skin. Wash treated skin with soap and water once indoors.

Permethrin: Gear & Garment Treatment

How it works: Permethrin is applied to fabric, where it repels or kills insects that contact treated clothing or gear.

Best uses: Treat socks, shoes, pants, shirts, hats, tents, and outdoor gear. Do not apply permethrin clothing spray directly to skin.

Pros:
- Long-lasting on treated clothing and gear
- Especially helpful for tick-heavy trails, campsites, wooded areas, and tall grass
- Once dry, it is odorless and does not feel greasy on clothing
Cons:
- Must be applied ahead of time and allowed to dry completely
- Only protects the treated fabric; exposed skin still needs a topical repellent
- Wet permethrin should be handled carefully and kept away from pets and waterways during application
Pro tip: Treat clothing and gear outdoors or in a well-ventilated area. Let items dry completely before wearing or packing them. Follow the product label for how long the treatment lasts and when to reapply.

Safety & Skin Tips

Choose an EPA-registered insect repellent.
Patch-test a new repellent on a small area first if you have sensitive skin.
Apply only to intact skin—avoid cuts, scrapes, irritated skin, eyes, and mouth.
Follow label instructions for age, application amount, and reapplication timing.
Layer wisely: sunscreen first, insect repellent second.
Use just enough—a light, even coating is all you need.
Wash treated skin with soap and water once indoors.
If a rash, burning, swelling, or irritation occurs, wash the product off and consider checking with your dermatologist.

Quick-Reference Chart

Active	Application	Mosquito Protection	Tick Prevention	Duration	Notes
DEET	Exposed skin; clothing only if label allows	Excellent	Excellent	About 2–8+ hours	Long track record; may feel oily; can damage plastics/synthetics
Picaridin	Exposed skin; clothing if label allows	Excellent	Excellent	About 4–12 hours	Low odor, non-greasy, gear-friendly
Permethrin	Clothing and gear only	Good to excellent on treated areas	Excellent on treated areas	Often several weeks or several washes	Kills or repels on contact; must dry fully before use

Scenic Dermatology’s Take

Whether you’re headed to the cabin, hiking wooded trails, watching kids’ sports at dusk, or just trying to enjoy the backyard, Minnesota’s bugs don’t take a day off—and neither should your protection. At Scenic Dermatology in Chaska, our board-certified team recommends permethrin-treated clothing plus picaridin or DEET on exposed skin for a double layer of defense. If you develop a repellent-related rash or need expert help with insect bites, bite reactions, or lingering irritation, call us at (952) 520-5000 for an appointment. Enjoy the outdoors—with fewer bites and better peace of mind.