What Could Be The Reason For Presence Of Bite-like Marks On Abdominal And Thigh Areas?

I have recently discovered that I have small sized bite-like marks. Mostly on my abdominal/stomach area. The only others are 4 on my inner thighs (these were the first ones, before the others occurred. I was wearing shorts for quite a few days previously) and 1 on my left lower arm. They re little more than a slightly bump on the skin, red, and today it appears to have dead skin in the centre or something akin to that. Perhaps they had them all along, I just didn t look closely enough. They re not bed bugs, and they also have absolutely no sign of itching or many other symptoms such as that. The only way they bother me is that they re red and there s a plentiful amount, or so it seems; perhaps I m exaggerating, I don t know. It s really bothering me, so could you please inform as to what these could possibly be, that would be splendid. Thanks for your time! -Anonymous