My best guess is that this is
folliculitisFolliculitis
Folliculitis on the leg
Folliculitis, decalvans on the scalp, or
blockedBlocked tear duct pores. They can come spontaneously, or after
sweatingSweating
Sweating - absent, etc. They mostly don't need to be treated, and subside eventually on their own. If they stay around more than 2-3 more weeks, have someone take a look at them. Best to leave them alone--no scratching etc.
Best.
Dr. Rockoff