For context I suffer from congenital lymphedema of the legs (since birth) so I have had weird bumps etc on my legs before, but I noticed this four weeks ago and it hasn't gone away or changed at all and don't remember having one like this before.
Obviously I've worked myself into a state about skin cancer (particularly lymphangiosarcoma - a deadly but rare cancer people with lymphedema are more at risk of)
Any idea what else it could be other than something terrifying?
Seeing my nurse this week most likely, but just in a real state about it this morning 
Sorry for the poor picture quality but quite self conscious of my legs.