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You should never try to speed up the release of the patch.  A good friend of mine does occasionally, but it's dangerous.  He will rub the patch to warm it up from friction, or take really hot showers, anything to open up the pores in his skin and absorb the medicine faster.  This really increases the chance of overdose, something that happens quite often with transdermal patches.  The warning label tells you to avoid situations which would raise your body temp. or cause sweating etc.  Plus, the faster you use it up in the first few days, the littler the effectiveness on the 2nd and 3rd day.

You've only been on a few months and you're already up to the 100 mcg/hr???  That's unusually fast for this type of medication.  It should be stepped up slowly, but a lot of doctors aren't familiar enought with fentanyl to recognize the dangers and to know how to prescribe it properly.  Normally, the doctor will start you on 25 mcg every 3 days, then as your tolerance builds (over a few months) it should go to every two days, then up to the 50 mcg every 3 days, then every two days, and so on so forth...  They even make a 12.5 mcg patch now that helps slow the stepping-up process.  At your pace, you are going to develop a tolerance so quickly that it will take a very large amount of the drug before long to help you.

My advice would be to take quahog's advice and ask your doc for a breakthrough medicine.  And then ask him about laying out a schedule for up-ing your dose, using the 2-3 day method and also the 12.5 mcg patches.  But please, please heed my advice.  Fentanyl is a very, very potent drug and should be respected as such and not taken for granted.  If you overdose on fentanyl, the drug can continue to release into your body up to 17 hours after the patch is removed.  Misusing this drug could be deadly.  You really should thoroughly read the information sheet provided with the prescription.  Fentanyl is a very effective drug for chronic pain when taken correctly, but it is also very dangerous and has high dependency and abuse risks.  Please talk with your doctor about this, and if he's not familiar enough with the drug to prescribe it properly, then he should refer you to a pain management doctor or someone else better qualified in pain management.  Please take care and keep us informed.