What Does A Pimple On The Wrist Indicate?

Have a small pimple/zit about 2mm wide that is red on side of wrist. It wasn t red before I pushed on it and seems to be filled with the fluid that usually comes after popping a pimple. When I attempted to pop it, it turned a very red/purple colour, but a small amount of something similar to popping a pimple came out and now it s a little harder and bigger of a bump than it was before. It doesn t hurt at all and I ve had it for about a month or two now. It seems to have a very very tiny hole in the middle of it where the fluid comes out. I don t know what this is so I just want assurance that it isn t anything serious.