Weird lump/blister after a molt

[x_raphael_xx]

Lucky the b.albiceps molted and is looking very pretty again. But I noticed she has a weird blister-like spot where her abdomen meets her carapace.
Something to worry about? Or usual thing? Did she just lie funny when molting?

 

[x_raphael_xx]

Edit: Just sexed the molt, shes a he...if that makes a difference

 

[x_raphael_xx]

Just updating that the T seems okay and not bothered by the blister.
I can only assume he molted a little weird.

 

[Lawrence b]

I think I posted on a forum when first started something the same but mine was that bit in the middle was enlarge . Maybe your Ts got 2 off them .