They could be one of many things, I would suggest maybe pupps but that usually presents in itchy bite bumps and also is accompanied by a welting red rash and is ridiculosly itchy! But it doesn't sound like it, it could be hormonal mini pimples - I had then all under my chin like really close together and a bit irratating they did not pop or anything. Maybe If it really gets irritating go to either a naturopath or a dermatologist?? Good luck! Xx