Does lack of blood flow to penis cause discolouration? Will the colour restore after I cure cure my erectile dysfunction?

Here are some... Skin color of the penis changes and becomes darker some time after engaging in sexual intercourse with females because of its exposure to estrogen. Such expected change (after reaching its highest level in 1-2 yrs but depending on how often intercourse takes place.) will stay and is nothing to do with circulation. Besides, ED could not be cured but just modified, and penile color remains the same.