Two days back while making tea the hot water fell directly from the stove on my Mother's hand. She immediately put water and ice on it. The burning feeling went away after a few hours but it has formed one blister on finger. She's putting a burn relief over the counter ointment on it and there's not such pain only if the blister gets irritated. I'm attaching the pic for your reference kindly let me know is it serious? And what to do next?