I put new batteries in my wii yesterday and it didnt work so I took them out again and did the old tounge test without looking properly.  It tasted foul and I quickly wiped my tongue but this morning I have some ulcers in my mouth.  OK so I deserve it for massive stupidity but my question is how serious is it, and will I get away with just mouth ulcers?
Thanks for your query, I have gone through your query. Nothing to be panic, it is an allergic reaction or contact dermatitis in response to the batteries. Consult an oral physician and get it evaluated. Meanwhile, you can take topical anesthetic and analgesics like Anabel gel, apply 3-4 times daily for 5 days. The lesion should heal in 3-5days. If the lesion does not heal then consult the physician immediately and take topical steroids like triamcinolone acetone 0.1% 4-5times daily after food. I hope my answer will help you, take care.