Mid 2010 Macbook Causing Burns

Perhaps someone here can help me out, because I have no idea what else to do. I have had my computer in for repair at an applestore twice and it has been sent off to a repair center. All of these places have said that my laptop is functioning normally, with the exception of the first instance where the hard drive was showing signs of failing and was replaced. There are two reasons for repair, and the first was that the computer would go into sleep mode or shut down, which it no longer does after the hard drive was replaced. The second is that it is hot enough to burn me, and some other things I set it on (lifted the varnish off a dining room table). The heat starts by where the charger plugs into the computer, and spreads throughout. Here's a quick picture of the scars on my leg. Note that I do have cloth between the skin and computer, but when my skin touches it, I feel it and place it elsewhere.

Please keep in mind that this is with diagnostic tests running the CPU and other components at 100% according to everyone I have talked to. However, the last time they said that I also saw last year's Grammy awards and Jimmy Kimmel (among other late-night hosts) in my safari history. The second time I went to pick up my computer, I wanted to see if I could get any slightly different results. I put up Guild Wars 2 with Skype and mail running in the background for literally 30 minutes, got the tech to come out and he stated that it was hotter than he'd ever managed to get it despite the tests. I realize that is anecdotal, but it's the kind of thing that sticks with you when said.
I also just got a call from the repair center today, and was told that they could not replicate the issue. Under all of their tests they said that it was running at 43 degrees Celsius, and there was nothing they could do unless it reached 50. Considering that according to this: (http://www.ncbi.nlm.nih.gov/pubmed/15353932) anything above that poses a risk for burn injury, I am concerned. Is this actually normal? Can I do nothing to resolve this situation? Did I really waste money on a computer I can barely use? I spent $2,400 on this computer and 3 year applecare, and while it has been wonderful in two circumstances (Board replacement, HDD replacement), it seems to fall flat here. If I can't use a computer without risk of personal injury, then I can hardly use it.

Thank you for your time.