Penis head rash

hi, I've got a red rash on my penis head. I have had it for several weeks. Tried just washing with warm water and keeping the area dry. Also I have tried OTC thrush cream for five days but this has had no effect. Any ideas? Balanitis comes up regularly but I thought it would respond to thrush medication if that was the case.

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Is your penis head dry? Are you circumcised?

Uncircumcised. And not particularly dry, no.