Whenever a no-see-um bites, it leaves a very small purple mark that can swell into a bigger pink bump, normally having a purple dot at the center. Be aware that from the very first challenge of 2016, this journal makes use of post numbers in place of page figures. See https://healingbugbites39257.ltfblog.com/26505777/healing-bed-bug-bites-quickly-an-overview