Hello My Corona Keeps Going Purple Tim To Time Been

Hello my corona keeps going purple Tim to time been to sex clinic had sti checks came back clear, consultant give me dermal said I had balanitis, balanitis cleared up he said, I'm left with very dry skin on my penis head , it's alrite when I get up in morning but gets worse as day goes on,I have a shower twice a day and moisturise with dermal lotion