Although I cannot offer a specific diagnosis over the Internet, it is unlikely that you will die from this problem. There are several different inflammatory conditions that can cause the findings that you describe. While cancer can occur anywhere in the body, cancers arising in the area of the anus or buttocks are extremely uncommon in adolescents. Inflamed skin cysts, or inflammation of hair follicles of the skin, in the "butt crack" area are rather common. Some of these inflammatory lesions will resolve with hot soaks and avoiding prolonged sitting (especially on hard surfaces), while others may be more chronic, and may require medication, or even surgery, to treat.
Since it is impossible for me to examine you, I would suggest that you visit your family doctor, and ask him/her to have a look at this area. Your doctor can then advise you whether or not further treatment is necessary.
Sincerely/ Robert A. Wascher, MD, FACS
http://doctorwascher.com
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