Ya maybe it is itchy and that's why he keep sucking to ease the itch. Find a teether that he likes? I tried through many different brands of teether before I found one which she has some interest in. It was the banana teether. Guess it is more straightforward for them to hold and insert into their mouths like a finger. Those round type teether or with weird shapes all no use to me hahah
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It look like a mosquito bite to me