Looking for help

Normally I wouldnt post this sort of thing here but we are getting a little worried. Our son came home from a relatives last week near cardinal with a rash and sores that have gotten worse over time. Now our 6 year old has a little spot that “appears” to be similar.

What the heck is this?

Diagnosis or “guesses” from M.D’s so far

Wild parsnip

Autoimmune deficiency

Pemphigus vulgaris

Update

It is impetigo with a staph infection. Antibiotics and steroid cream has been prescribed.