Lump

I wasn’t having a showe and I noticed a lump on the back on my anus external it’s very squiggy and not painless at all just irritating 

Sounds like you have piles

Or a cyst

In case you're not familiar with the term piles, it means hemorrhoid. 

I'd go to the doctor and get it checked out!

Could be a skin tag. I had one years ago and got so worried about it, I took myself off to a sexual health clinic. They pronounced it a harmless skin tag and froze it off.

I think that’s haemorrhoids . It’s a swollen and inflamed vein in the rectum. Ointments will do the trick. Get rubb and apply directly on the surface.