Anyone else's coeliac rash ever gotten like this?

These days when I'm accidentally taking in small amounts of gluten, first warning sign for the last year ish (it changes) has been very itchy rash on my fingers. I used to get the coeliac rash (dermatitis herpetiformis) pretty heavily on my elbows and other areas so I assume it is the same rash but on my fingers at the moment.

Anyway, it was particularly itchy the other day so I scratched it a lot. I then didn't really scratch it for the next few days. I woke up this morning and realised that it has got super painful and honestly looks like there is a pus ring around it? Idk, sorry if too graphic but I've attached a photo cause I'm really worried about whether this is a sign of serious infection or just that I scratched and irritated it too much.

On the closer finger, you can see what the rash normally looks like. On the ring finger it is super raised, red and very sensitive.