Sorry, how to post new thread in this forum ?
this is most likely small vessels vasculitis
it is self limited disease , usualy end by postinflamatory hyperpigmentation
it is mostly idiopathic
but somtimes follow upper respiratpry tract infection
during attack , systemic steroid and antihistamin are benificial
I have the same problem. I havent had the cough but I have the same thing and it covers the upper are of the back of my legs and almost my entire buttocks.