Tender after laser

I had my first session of laser hair removal 1 week ago for my groin and armpits. I’ve only struggled with HS in my groin, but wanted to do the armpits as well just in case.

It hurt like hell there and then, but after the session I didn’t feel anything. That was until today. Both my armpits hurt when I touch them, kinda like touching a bruise, and I swear I can feel a slight bump. Could it be that the laser has triggered something? or is it normal to feel tender right around the time when the hair “falls off”?