A few things come to mind.
You could possibly be slightly dehydrated, remeber that as you gain mass, your muscles require more water and unless you adjust up accordingly your body will not allow you to perspire.
Some people are more prone to skin irritations. AS you introduce gear into your system, the changes in hormonal levels can and do play games with bodies natural bacteria. THis is why some people get very bad acne while on. YOur hot tingly feeling could just be a reaction to heat which increases your skin sensitivity. Not with standing breaking out, if you take something like Benydryl (sp) it might clear it up.
BPP