I had the same on an ultrasound in September, can't remember the exact size but 'like a pinhead' the doctor said and the report said it was not clinically important. 

I, like you, was very worried initially, especially as it was not there a year ago.  I am 32, have never had a cholesterol check

I now have started having right sided abdominal pain (although it is lower abdomen), and am seeing a private consultant as my GP isn't concerned but I am. I may pay for a repeat ultrasound too as that might be reassuring. 

If it weren't for my pain though I wouldn't be quite as worried. 

Have you asked your doctor about it again since you have done some research and started to worry?  

Hello jeik.  It is never a good idea to look these things up on the internet as every who does so seems to descend into panic and convince themelves that they are seriously ill.    I can understand this as I have in the past done this myself.  I am now 65 years old and none of my worst fears have ever come to anything.  It is not difficult to convince yourself of the worst.   Did your doctor not give you any advice or treatment?  If not I should return and ask what you need to do.  And do whatever it is.  Best wishes to you.