Not sure if anyone can help and I do have an appointment with a specialist next week. I have not found anything similar to what I am experiencing anywhere on the internet. Three weeks ago a large blister appeared on my knee. It had a red ring around it and it appeared to have yellow fluid in it. It was very painful before and after it burst (due to location it rubbed on clothes etc). It took days to scab over and still hurts. There was no trauma to the area beforehand. A week ago the exact type of blister, large, single and filled with yellowish liquid (also a tough blister you could touch it and it felt ...for lack of a word blubbery?) this one was located right at the top of my bum, closer to my lower back. Again, no trauma to the area. It burst like the other and is currently healing but very painful. About the size of a quarter. Two days ago another appeared on my left side. Single, large, yellowish fluid and again very fleshy. It also burst today as all of the blisters have been in horrible places. It hurts a lot. I went to the after hours clinic and they recommended blood tests and a urine sample. They said it could possibly be bullous phemoid (something like that) but I am only 24 !!? Also I keep reading about herpes however no blisters have been (down there). He didn't recommend a herpes test..... in any case I am desperately worried and constantly fearing when and where the next one will be....Also this year I have felt more tired than usual ...I am at a loss does anyone know what this could be !?