I need a good tea tree oil shampoo what are good ones? I have scaly itchy rashes on scalp causing hair loss and want to try tea tree!

Tea tree. While tea tree oil has antiinflammatory properties , salicylic acid shampoo such as t-sal by neutrogena may be helpful for dry itchy scalp . See your dermatologist for the best treatment options.
None. There is no good tea tree preparation. Why are you taking griseofulvin? Find a better DR. I suggest a dermatologist.