Dear mustafa111,
what you have discribed to me is a pylonidal cyst. I have had two in that same area. Thank god yours is only ooozing watery bloody liquid. Normally they ooze a puss like liquid that has an odor that could make you puke. They can grow to be the size of a marble or larger. If you put hot compress it will soften and hofeully pop on it's own. If you see alittle white plug, andnd you squeeze near it, it should rupture. You can have these lanced, but no gaurentee they will not return. I have had a total of 12 of these cysts in the last 15 years. One time I had 2 near yours, and I went to a doctor, and found little black dots in a row dow the crack of my but and told me they were future cysts...Something your born with and will activate in their own time...I was to uncomfortable I had surgery to remove them..When I woke up the surgeon tole me I had at least 6 future cysts marks, and took them all out. I have a permenent scare down my crack.., but it's worth it. Now I get them around the base of my neck and near my ears. I had a hugh one that I though for years was scartissue from a cycst removal pro cedure 10 years ago, and I ignored it. Last christmas it hurt so bad I put a hot compress on it and it burst. The dry pus that came out of it was like cottage cheese, it mearsured the size of a golfball. The odor was so bad in my house when it burst, my cat threwup and hid for three days.
If you have one, you have the possibility to have others...If you have seen a doctor since you posted your message, please reply back..I am curious how you made out.
Take care....China105