belly button pain and pus

Last night I noticed a slight pain in my belly button (it felt like it was coming from behind my innie belly button) today, I noticed the same pain but a little more intense. After I pushed right above my belly button really hard earlier, a lot of thick white-ish yellow pus started oozing out of my belly button, the more I pushed the more pus came out (kind of like a really big pimple). the pus started to turn red (i think from blood?) and it decreased the pain for a little. I've had a similar problem with belly button pain, and pus but i've never noticed that applying pressure makes the pus come out. Any ideas about what it may be?