### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
I have a oblong lump on the side of my butt cheek that has just become painful and larger in the last couple of days.  I first noticed it about six months ago when is was small about the size of a pea.  There was no paint, just itching then it basically wasnt of major concern and I figured it was a ingrown hair.  Two days ago I had a larger bowl movement that cause some discomfort.  Now that lump is oblong about 1/2 to an inch and painful.  What could this be?  No redness, maybe a little purple.  No head and a little bit of blood from my bowl movement this morning on the tissue paper.  No other blood from the other bowl movements today.  Just a hard oblong painful lump on the left side of my butt cheek near the anal canal.

### output:

Hi, I had gone through your question and understand your concerns. At this area it may indicate several issues and most common are colonial cyst or perianal abscesses. These are inflammatory processes in sacral and perianal area usually manifested with pain, redness, swelling, fever and pus discharge. Cellulitis is less common and may be present in sacral area as well. This is mostly caused by beta hemolytic streptococcus, and it necessitates antibiotic treatment with augmenting, or combination of Capitol+ metronidazole. You should also, apply cold compresses, take nonsteroid painkillers such as ibuprofen 400 mg and rest. If there is no improvement within 2 days, you should see doctor and have intravenous antibiotics. Hope this answers your question. If you have additional questions or follow-up questions then please do not hesitate in writing to us. I will be happy to answer your questions. Wishing you good health.