How To Get Rid Of The Burns In The Finger?

hello,
apologizing for my english.
about three days ago i've noticed some weird burns (im really not certain these are burns, i got my finger burnt a few months ago and it looks a bit the same). i have no idea where they came from. when i first saw them they were pretty small but with time they started growing (i have two spots which are located right under my elbow).
i'll give the most precise details i can give about the looks of it.
well the middle looks like a healed bruise, then around it there's some deep skin layer, further out is the same just covered with a whitish delicate skin and the whole thing is encircled with some redness. this "thing" doesn't bleed.
so far i've rapped it with a bandage to make sure it doesn't get infected, i've also tried some burn cream, and some times a sort of medical sponge i used on my previous burn in order to suck liquids i guess.
my question is, how do i take care of it? and right now i am supposed to take a shower, should i shower it? (it burns when i do) or should i keep it away from the water? (as i did with my burn)
thanks in advance!