Thumb sucking thumb raw?

Amarillys/22🧚🏻‍♀️

I noticed my daughters thumb is super raw and the skin feels like dermatitis to me or eczema and she’s been a thumb sucker since she was a baby (she is 2 1/2 rn) and I’m so confused why it looks like this and it’s so big compared to her other thumb. I’m making sure she’s not sucking on the finger but I’m worried if I need to take her in if it’s an infection. Please if other mommas dealt with this help with advice.