Weed Salve for Skin Conditions: Evidence, Risks, Use

Short answer

A cannabis salve is a wax and oil mix with THC, CBD, or both. It sits on top of the skin. Evidence that it treats eczema, psoriasis, or acne is thin. The FDA has not approved any cannabis product you apply to the skin. A salve may help with dryness and comfort. It is not a replacement for prescribed treatment.

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What a salve is

A salve contains oil and wax, such as beeswax or candelilla wax, and no water. Creams and lotions contain water, which lets them absorb into the outer skin layers. A salve forms a film. That film holds moisture in and keeps air out. Occlusion can help cracked or dry skin. It also limits how far the cannabinoids travel. Most of the dose stays in the stratum corneum, the dead outer layer.

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What goes into the jar

• Cannabinoids: THC, CBD, CBG, CBN, or a full extract.
• Carrier oils: coconut, olive, sunflower, jojoba.
• Wax or butter: beeswax, candelilla, shea.
• Added items: menthol, camphor, essential oils, arnica.

The extras drive much of the cooling or tingling feeling. Menthol and camphor act on cold sensors in the skin. That sensation is not proof of a cannabinoid effect.

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Skin conditions people bring to salves

• Atopic dermatitis and eczema
• Psoriasis plaques
• Acne and acne scars
• Dry or cracked skin
• Minor scrapes and sunburn
• Itch from other causes

Skin holds CB1 and CB2 receptors, plus TRPV1 channels. That gives researchers a reason to study cannabinoids in dermatology. A reason to study is not proof of benefit.

Evidence level

Most reports are small. A study of a CBD ointment in 20 people with atopic dermatitis and psoriasis reported less itching and redness over three months. A case series described CBD use on wounds in epidermolysis bullosa. Reviews of topical cannabinoids note short follow-up, few participants, and no control groups. No large randomized trial supports a salve for any skin condition.

Risks and limits

• Contact dermatitis. Cannabis, essential oils, and preservatives can cause a rash.
• THC absorption. Intact skin takes up little THC. Broken skin takes up more. A psychoactive effect is possible.
• Label errors. FDA sampling found CBD products with wrong amounts and undeclared THC.
• Unknown interactions. Topical use with other drugs is not well studied.
• Infection. Covering a wound with wax and oil can trap bacteria.

Use steps

1. Read the certificate of analysis. Check the THC and CBD amounts.
2. Patch test on the inner forearm. Wait 24 hours.
3. Apply a thin layer to intact skin. Stop if you see redness or swelling.
4. Do not apply to open wounds, eyes, or mucous membranes.
5. Store below 25 C (77 F). Keep the jar away from children and pets.

State law

Hemp CBD at 0.3 percent THC or less is legal under federal law. THC salves fall under state cannabis rules. Those rules differ by state for purchase, possession, and sale.

Questions for a dispensary

Ask for the batch test date, the THC and CBD content per gram, and the full ingredient list. Ask if the product contains menthol, camphor, or essential oils. Ask what the store does when a customer reports a rash.