Is 5 % pine tar enough to make a difference in soap ?
Just if you'd get the full benefits of the pine tarI don't know what "difference" you have in mind, but yes, 5% is fine to use when making pine tar soap.
I think soap makers often use 10-20% but I suspect the popular "Grandpa's Pine Tar" soap is about 5% pine tar.
I talk about this more here: Pine tar soap | Soapy Stuff
I'm open to having my mind changed, but so far I have not seen any evidence that pine tar is efficacious.
Make pine tar at 20% if you want to. Or at 5% or 10% or 15% or whatever.
With all due respect, from my experience, dermatologists are the worst! Like most physicians, as well as their patients, they/we are victims of the pharmaceuticals. Just ask my next door neighbor, a pharmacist. Doctors go to her for suggestions of what to try next if something doesn't work. And so it begins... the long journey and expense of trying one drug after another that simply do not work. (Ask any mother that has a teenager with acne.) Dermatologists rely on treating patients with steroids and statins that are more harmful than helpful and may lead to brain damage over time.it's advisable to consult with a dermatologist or healthcare professional who can evaluate your condition and provide appropriate guidance.