rash that never ends

my son has had a rash since he was 11 months and it hasnt gone away. hes 4 1/2 now.. the rash mostly is on his back but can spread to his limbs. they are red puss filled bumps, clear puss. they open or are scratched  open by my son. they have a hole in the middle of them and scab up and last for weeks until a new bunch show up. at any given time he can have 10 to 300 of them just depends. there is no pattern to when they show up. i have taken him to many doctors. he has been treated for SCABIES, ECZEMA, a rare type of WARTS and countless other thing but not one treament has worked. i have been told that he has a bacteria growing on his skin and the medication that they recomended was no longer avaliable so what they gave me didnt work anyways. if someone else has had this problem let me know  please. im so tired of this and i feel so bad for my son/ i cant help him he is forced to ware thing that cover everypart of him so that the "ichies" what my sons calls them dont get irritated. 9 dematoligist and still no cure. someone has to have had this befor & if you have can you please help. [my son is the only one that has ever has this. my husband, my youngest, & my self have never had not one bump] so this is even more puzzling. thank you for reading this and thank you even more if you can help.

[Bhupinder Kaur, MD]

Hello,
I emphasize with you for the suffering that the little one has to go through. Two possibilities that are coming to my mind are pustular psoriasis and Darier’s disease. Darier’s disease is characterized by dark crusty patches on the skin, sometimes containing pus. My advice would be to discuss these two possibilities with your son’s dermatologist.
I hope it helps. Take care and please do keep me posted on how you are doing or if you have any additional queries. Kind regards.