Welcome to Flyertalk elysaarriola, welcome to the BA Forum. It's good to see you here and I hope you will continue to participate here. Don't been too concerned if your posts gets moved to somewhere else, there are various guidelines about this, but we all recognise that FT navigation can be confusing to new people.

I would certainly carry something from your doctor regarding your condition, it may be useful in terms of prescribed medicines/creams etc. However I don't think you need worry too much, it may slightly delay your entrance, but if your prints are a bit cracked the technology these days can cope with this very well. It is not worth worrying about, eczema and psoriasis are very common conditions and CBP processes hundreds of people with skin conditions every day.