Blister advice please! (Thumb sucking)

[MaggieMuggins]

DD is 11 months and sucks her thumb. Since she got teeth it started going a bit red and raw and now she now has a very large greenish blister on it. DH seems to think we should go down the sterilised needle route...please can anyone recommend anything less scary??

dd had this at the same age - she bit it and it got infected Paed advised we plastered it up until it healed .

Thanks LIZS. Since I posted the above it popped and all the pus came out :sick face: so we bunged some Savlon and a plaster on it and popped a mitten on at nap time so she wouldn't suck it...and when she woke up the mitten was off and the plaster vanished...we're on nappy-watch