I have a chronically itchy scalp, but there's no scaling, psoriasis or anything like that. My dr. gave me clindamycin phosphate topical solution, USP, 1%, but didn't really tell me how to apply it. Do I just rub it around my scalp or what? I did that a couple of times, but the itching only stopped very briefly (an hr. or two), so I didn't use it anymore. Frankly, I don't think my scalp issue is a skin problem. Could this be stress-related?