6 month old with Rash

Molly
My son developed a rash Saturday afternoon (#1) then it spread to up his right side of his body by Sunday morning (#2)  I gave him Benadryl and it got a little better Sunday night (#3). 
Took him to DR this morning and they basically told me they don't know what it is or if it is contagious!  They said it was not an allergic reaction to his antibiotics plus I stopped them Saturday! Then the last picture I just took! Has anyone seen anything like this?

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