Charis spots.

Our Charis is immuned compromised.  She developed HSP a few years ago and has never been the same since.  They believe since it is a form of an auto-immunity disease that it has since piggy backed with another.  We have not been able to determine what that it.  She has joint pain every single day and swells in odd places at times.  When she had the HSP, it put her in the hospital for days and she was not able to walk for a while.  They have mentioned juvenile arthritis,  lupus, allergies and more but they just cant seem to figure it out.  It is honestly quite frustrating as we have seen so many doctors and they still just do not know.  Charis newest issues seem to be these spots.  We have gone to the doctor and they just have not seen anything like them and do not know what to think, again.....  They look like she took a hot pink highlighter and spotted her arm.  They have only come out on her limb difference arm and they do not itch or cause her any issue.  They are not raised or you cant feel them when you touch them.  They last about 3 days and have come on 4 times in the last month.  They do not think it is a form of purpura.  I just do not know what to do for this and the constant aches and pains she has.  We can walk on the moon but cant figure this out.  Gets frustrating at times.