White coat/film on glans and it is becoming thicker

Hi, I am a 16 years old boy. I am not circumcised and have a long and slightly tight foreskin, but I can fully retract my it. My glans is very sensitive and hurt to touch therefore my way of cleaning the glans is apply some soap and rub it with the foreskin. I am doing this for over 5 years and it is very effective. There is no smegma for most of the time. But recently, after changing a body wash, I found that a white coat/film, almost like a skin is forming on my glans, which I think is smegma. It stick to the glans very tightly and hard to wash away. I have this problem before but the film/coat can be removed easily after washing it and the glans will stay clean as long as I wash it everyday , but this time it just stay there and seems like becoming more serious(the coat becoming thicker). What should I do? Maybe this is an allergic reaction of using that brand of bodywash? Maybe I should use another brand of soap/bodywash? Thx

Btw, I don't think that is any kind if infection as after cleaning the white stuff away, the glans looks very healthy. No rash, red spot, no pain or whatever.