Ghost, go to a dermatologist when you have the sores so he/she can examine them. The sores I get with the clear fluid and crusting are cold sores (herpes virus). Find out if your lesions are also from this virus. I've gotten them since I was a child whenever my immune system was weakend and/or I was feeling run down, usually 3 or 4 times a year. Since I'm on drugs that suppress my immune system, these cold sores are an everyday thing. I am hoping that by switching from MTX to Imuran the sores will stop or lessen, but in the meantime I have a prescription for acyclovir which works very well to keep them under control. If I take acyclovir every day, twice a day, no sores. If you only get them occasionally and take the acyclovir as soon as you feel one coming, it will knock it out quickly but will take longer if the sore is already established.
Hope this helps. If you have the same problem I have, I understand how hard this is for you. They not only look awful, but they can be spread to other people, so you have to be so careful not to infect anyone else with this virus.
SLE, SJS, vasculitic neuropathy, Degenerative Disc Disease, Chronic Autoimmune Urticaria