I Have A Sever Rash In The Hairline Of My

I have a sever rash in the hairline of my scalp. I have been put on prednisone, and another drug. and a cream. I have a Dr apt tomorrow. But this itch is driving me crazy. Benadryl helps alittle. Lice has been crossed off the list. I also have been using Selsum Blue. My hair is waist length and have NO plan on cutting it.
help me get thru tonight without itching...