It is important to keep the area moist by sealing it off from the air.
It is very possible you will develop an itching, aggravating heat rash below the cellophane, especially if you don’t remove it to wash twice a day. If this happens, I suggest applying a Zinc Oxide cream (used for diaper rash) twice daily to the affected areas. This will almost immediately begin to remedy the irritated tissue.
Your body will eventually (around 3-6 weeks) generate enough scar tissue to completely cover any open wounds, and at this time you may decide to rub, scratch, smack, itch, etc. the design to build even more scar tissue without risk of blowing out lines, but it is important that if you do this, do it to ALL of it, or you will find yourself having more areas that raise more or less than others.
In the end, the degree of keloiding you experience is largely dependant upon your genetics. The reality is that some people just scar more than others. As well, a cutting that is placed over many, or any, different moving muscle groups may scar more in certain areas as it is naturally irritated more from everyday action.