Why do my hands always catch on fire whenever I text people?!

It's the freakiest thing ever! I don't know if I should see a doctor or what. Only my friends and family know about it. They have no clue why it happens. My mom wants to take my phone away from me so it won't happen anymore but I can't live without my phone! I only got burned badly one time and there's a little small scar. But it's So scary when this happens to me! I'll be texting (it usually has to be for a long time though) and then while I'm holding my phone my hands suddenly catch on fire. I have an iphone 5 by the way. I even tried washing my hands before texting. I don't know what to do anymore

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