anyone have any skin rashes?

first time mom here. I have this weird all over rash generally on my legs, stretch marks on thighs and butt area. some on my side as well. one little bump itches like crazy. I spoke with doc bought benadryl still itching like crazy.. been leaving it alone for the most part but it's really uncomfortable. in the top pic my stretch marks are dark but if u look close there are small red dots look like they have clear fluid in them.