I served in the US Marines during operation desert storm and returned with a leg rash that looks like small pimples that are recurring.  If popped, they take about a month to heal.  They are about 1mm in diameter and will produce a small elongated white mass when squeezed.  The discharge is solid about 3/4mm long and .25mm in diameter and tapered to a point on 1 end.  3/4 of the way down its length, is a small protrusion.  Whats odd to me is all of the discharges are identical.
Hello, Thanks for the query to Chat Doctor. Forum. As physical examination of rash (wound) and white substance (larvae) is very important so, if, possible upload pictures of wound with larva. May be due to, River blindness (cholera volumes), guinea worm, creeping eruption (ancylostoma Brazilian), Leishmania Tropicana. Scrapping tests and stool examination are very important.  Consult a physician and get in his opinion. Good luck.