Is there such a thing as a Retin-a shed?

[bluechips]

I have been using Retin-a for about a month (.05% about 2-3 times a week) and I have 2 questions:
1. I seem to be going through a massive shed- has anyone else experienced a shed b/c of Retin-a? I know it also could be b/c of the Rogaine.
2. I feel that the areas on which I put Retin-a have lost some of their sesitvity to touch. Has anyone else experienced this?

Thanks.