Juliep is using a common treatment for the psoriasis on the heels that she is having at the moment. Wrapping with the plastic wrap is often recommended when undergoing this treatment, but you have to know how to wrap it correctly, and also, the occlusion increases the absorption, just like it does with steroid creams. So what's the big deal? Salicylic acid poisoning, that's what. Dizziness, confusion, headache, ringing ears, rapid breathing... SInce Julie is using in under occlusion I am a bit worried but she is also under the watchful eye of a medical professional so I am not too worried
Anyway, is this stuff available over the counter? Heck yeah. You can get up to 15-17% I think... It's in both anti-acne products (some varieties of such products as Clearasil, Oxy, Noxzema, Stri-dex) as well as anti-wart products (Wart-Off I think is 17% salicylic acid, Compound W, etc.). Also used for corns, calluses, and the like... basically skin thinning agent. Just try not to use this with another topical anti-acne product (benzoyl peroxide), alcohol-based, or other stuff that dries the skin.
I would see your GP about this, or your derm. This is a viable and often very effective treatment method for psoriasis on the heels, as Julie can attest to.
And Guzzi, if you are reading this - for whatever reason, salicylic acid is also considered a treatment for sebhorrheic dermatitis...