I would advise you to assume it may be an infection and have it cultured. My 14 year old with EHK has been dealing with MRSA, a very resistant staph infection, all winter. It has not been his "typical" infection either. They are little white bumps and when opened, liquid comes out. They don't get big and they haven't gotten all red. He has also been very itchy when he never has been before. Now I can't say for sure that is what his is because if you have read any of my other posts, he is dealing with something else as well and I just can't separate the two anymore.
In regards to the itching, Evan is taking Zyrtec and Atarax both but only at bedtime. Maybe that is a time you can be knocked out. One of the things we have learned this winter is to make sure to take the antihistimine at a regular time. If he gets off schedule, he is itchier.
Please keep us posted.