I have a large bulge on the side of my penile shaft.

Doesn’t hurt and only shows when errect. Sometimes it shows sometimes it doesn’t. Any ideas what this could be? Should I seek medical help? 

It's hard to say without a pic, but if it's recent, then it could just be a lymphocele, which would normally go away in a few days.

If you want to add a pic, you  need to be on a PC or laptop with a large window.  If you are, then you should see some extra icons towards the top right of where you type, and the right hand icon (which I think is supposed to look like the sun over hills) will add images.

The pic I've attached here shows the icons: 

To overcome the impact of long-term Lichen Sclerosis I use a variety of techniques, jelqing, targeted massage and regular use of a penis pump / developer.

I constantly get lumps bumps of all kinds appearing on the shaft of my penis - most do go away after  a few days - although one is being quite stubborn at the moment.

For ANYONE who does use a developer  / pump I would suggest they need to be extremely careful in the amount of pressure they apply, and the duration of the pressured period in total on each occassion they are using such!!!