There is a chance that the Fraxel could even inflame the keratosis pilaris. If your doctor is willing, it might be a good idea to first do a small area not more than an inch wide to see the result before treating an entire upper arm and wait several weeks to judge its result before having a...
Retin A does stimulate some small amount of collagen production in the dermis, but it is only effective for very superficial wrinkling. Retin A also causes epidermal cell turnover and freshens the epidermis and temporarily reverses some sun damage while it is being used.
Deep Fraxel...
Fraxel Repair and Fraxel Restore induce new collagen production and whether it is this or nerve ending rejuvenation within the new collagen causing the tingling is not known, but it is a common symptom in laser resurfacing and surgical reconstruction.