Looks like you have some serious phlem, puss pocket, or something built up around the back of your throat and the back of your tounge. The grey areas look like fungus, bacteria, etc. Could be the pic, I don't know? The bump doesn't look too strange to me. Get things all cleaned up (tounge cleaner, salt water gargle, good anti bacteria mouth wash, etc..) and then take another pic. See if the bump goes away as well. Yes, see a doc for your own ease of mind ASAP but if the growth was dark in color I'd be more concerned.