unusal rash with characteristic skin depression. HELP!

It all started about a month ago when the city I stayed had a huge hurricane passing by from another state. I didn't evacuate and stayed during that whole 3 days, the city was OK as we were just the collateral. First I started seeing some small white bumps that later turned red (like mosquitoes bites) coming up on my legs (ankles and thighs). I thought it was just some allergy or the changes in the water after the hurricane and ignored. These were really itchy. A week later, all these "pruritic red based papules and pustules" (as described by my dermatalogist) continued to come up and really itchy. I used betamethasone for a few days while waiting for the derm appointment. When I saw him, he said it might be bed bugs bites that got infected and prescribed 9 days of prednisone (60mg x 3d, 40 x 3d, then 20mg x3d), bactrim oral, and allegra oral. He also swab some stuffs off the lesions to culture. The culture returned negative (nothing was able to grow). After 9 days the steroid really suppressed it, but it recured 3 days after I finished the steroid: 1/2-a-coin bumps that turned red after appearing and got really itchy. I used the betamethasone on them together with the lanacane OTC to help itching; after the itching stop, the skin where it appeared becomes sort of depressed and the inside of the depression showed some very small lines/waves just like blood vessels. I came back to derm, he took 2 biopsies of my big toes' lesions where the bumps appeared. He gave me clobetasol which he said the strongest available. I asked to start another pred regimen. I started on the pred for about 5 days and again after 2 days it suppressed the rashes. But after 5 days, I got miserable with the pred SE like heart rate, CNS effects, and terrible acnes and stopped the pred. So I came back to the derm (1 week later, at this time I already stopped the pred after 5 days taking it). The biopsies return as "lymphocytic vasculitis" and not bites at all (the MD did the test said "thruout dermis mononuclear infiltrates found and eosinophils were absent, a viral process and less likely insect bites could be examined"); and the derm explained to me that it (lympgocytic vasculitis) could be due to several things like herpes, Pleva, Lupus, etc. He started me on Doxycycline and other topical like differin + benzoyal perozide for the acne. At this time, the rash was sort of subsized a bit so we decided to not chase after it.
But then about 4 days later, it came back with the same characteristic bumps, this time they were smaller like dots (red and itchy) and not as many as the initial break-out. I came back to the derm and he did a lot of blood tests on: complete metabolic + urinalysis, Rh factor, anti-nuclear Ab, complement, Sjogren's Ab, Smith Ab, RNP Ab, DNA DS Ab, Neutrophilic cyto IgG, herpes panel. All returned normal except the anticardiolipin IgM (normal is <10, mine is exactly 10). A week later (I was still on doxy 200mg qd during this whole time) I came back to see the blood test results and told him that for about 3 days after these tests, it was gone-I was so happy. He explained the results that it might be clinically insignificant as I am so healthy with other tests (I have no STD no HIV, no chronic disease no anything) so this anticardiolipin thing might just be something irrelevant (plus it's IgM-initial exposure not IgG). He refered me to a rheumatologist for antiphospholipid syndrome evaluation and said that if it was pleva then it was responding to the doxy. I came home and set up the appoint with rheu for after xmas.
Now, 1 week later it sort of coming back with on and off itching, I always used clobetasol to suppress it (cause I can't go back to pred as it made me so miserable). It's just like this: I feel itchy at a place on my leg or arm, I rub a bit and then a small red spot appear, I put some clobetasol on it, the red area start getting bigger to a 1/4 size of a quarter, if I scratch the dot it sort of breaks up into small little dots (like a tip of the pencil) around the main one (just like you use a pencil tip to break up a water drop on the table surface). After I put the clobetasol on for 2 days, the itch went away but of course the skin got so white due to the steroid and again there is a depression characteristic to the picture (in the center there are waves/lines of vessles, like those you see in your eye white part). Last night, I started realize that whenever i drank coffee, I got these itchy things coming up. I realized that during this whole course, I had a lot of starbuck blackeyes every day. This morning, I had to drink a lot of coffe to stay awake to take final exam (I'm in professional school) and when I came home, 2 more small dots coming up on my ankles near the old one (the 2 new one are the red spots to the right of the picture, the old ones are at the bottom of the picture with that characteristic depression), again I put clobetasol on it.
I have no idea if I'm allergic to coffe or not. But I don't understand why as I was drinking starbuck eversince I've been in college 4 years ago until now when I'm in professional school. During this whole course, I had my aprtment clean/checked for bugs (nothing was there); change all my beddings/soap/detergents/deodorants/cologne. I started thinking that there were days during this course I took my protein shake (NO explode) for my weight lifting and it has caffein in it (that might explained the on-off natures of it). I am not sure if because of coffee/caffein that causes these bumps (but again, I've been drinking coffee forever and now all of a sudden I can't drink it?). A friend of mine in med school did the glass test (press the glass against the skin) and said it was not clotting/bleeding inside the skin. I looked up everything like pleva and that antiphospholipid syndrome but not sure if I had those. Now I can't go back to my derm as he says I need to see the rhematologist for antiphospholipid syndrome evaluation ( and I he also stated that there was no other things I could do more). But from what I know that syndrome causes sort of livedo rash on the thigh which I don't have. My rheu appointment is not until after xmas and I'm so desperate now--nolonger looking forward to the holidays. I decide to stop all caffeinated products starting today to see if anything changes. Any help or opinions would be truely appreciated. I'm still on the doxy 200mg qd and allegra 180mg qd (of course with the clobetasol inhand in case it comes up again). thanks in advance.          

[missnanny]

I think we have the answer to why lymphocytic vasculitis

You said this occurred shortly after a hurricane passed through.  I remember when we watched the reports on Hurricane Katrina, I thought to myself ... "Wow, these people are going to be exposed to 'the butyl' chemical."  Different things were broken, with chemicals in the water, in the air.  I don't remember right now what caught my attention, but I look for health changes after possible exposure to this chemical and the worse exposure is getting the vapors in your eyes

Do you also feel more tired than you used to?

This chemical will cause an anemia without alerting the doctors to it,
as several things start going wrong & it messes up what the numbers would otherwise mean if you only have one thing going wrong, and 2-butoxyethanol can cause any of the medical 'numbers' to go high or to go low ...  Best thing to do is to have the lab tech LOOK at the RED BLOOD cells and tell the doctor everything they can find out about them:  age, membranes, size, shape, etc