Snail has lump?

[Paracheirodon]

Hello all,

My aquarium snail has a protuberance which has been present for at least a day. I was wondering if anyone knows what it is and what I can do about it?
It seems to be fine otherwise - eating and feeding as normal.

Thanks

 

[FreshyFresh]

Kind of looks like he's waving.

I take it the area of concern is on the soft bits and not the shell?