External parasite?

[dntx5b9]

I have noticed that there are one or two white string looking thing embedded on the side of the fish. The length is barley 1/8 to 1/4 inches. They don't seem to bother the fish and I see one once in a while. Are these some sort of parasite? If so, what should I use to treat the tank? I have seen these on three of my discus within the last three or 4 weeks. They seem to disappear after about 3 to 4 days. Any help would be greatly appreciated.

[fishgeek]

maybe google images of lernea, argulus or leech's(pissicola)

[fishgeek]

pissicola

[fishgeek]

p-i-s-s-i-c-o-l-a
stupid machines

[dntx5b9]

So, no one had this happened to their discus?

[samir]

is it along the lateral line ? otherwise google Lernaea (can treat with trichlorfon)

[dntx5b9]

Googled lernaea, but it's not it. It's not along the lateral line either. The closest thing it resembles is a short thick white cotton thread. Any idea?