I've been on Tamoxifen now for about 2 months and no bruising. I did have bruising when trialing the letrozole, but the bruises went away once I switched away from AI's to the Tamoxifen...that said there is a rare side effect of stroke or blood clot with Tamoxifen so it is a very good idea to go get the bruises checked out. I have no idea if the two things relate to each other, but better to be safe than sorry!