I think you're right to question this. It could simply be a bug bite
, but unless you're sure, it's best to biopsy
the lesion and get it checked. He's only 1 and this spot appeared only in the past 6 months? Now it got inflammed for no apparent reason, excluding possible bug bite. I would shave or punch biopsy it and possibly do an excision to include a healthy margin around it. It's a simple painless procedure that can be done in the office. You should certainly get it checked, especially if the size, color, or internal shades have changed. Also if the borders are irregular.