Most likely, the corner of his mouth is cracked because it is dry from the air conditioning or because he drools out that side of his mouth as he sleeps, and it has got infected/irritated. happened to me all the tme as a kid (drooling combined with dry skin) and young adult (dry air from AC). Chapstick is my friend now (summer and winter) and I've had no problems for 8 years or so. i pay special attention to the corners of my mouth.
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The most difficult thing is the decision to act, the rest is merely tenacity Amelia Earhart
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