[1] : The Collaborative International Dictionary of English v.0.48

rash \rash\, n. of. rasche an eruption, scurf, f. rache; fr.
   assumed ll. rasicare to scratch, fr. l. radere, rasum, to
   scrape, scratch, shave. see rase, and cf. rascal. med.
   a fine eruption or efflorescence on the body, with little or
   no elevation.
   1913 webster

   canker rash. see in the vocabulary.

   nettle rash. see urticaria.

   rose rash. see roseola.

   tooth rash. see red-gum.
      1913 webster
see also:
rase rascal canker rash nettle rash urticaria rose rash 
roseola tooth rash red-gum 

[2] : The Collaborative International Dictionary of English v.0.48

canker rash \can"ker rash`\ med.
   a form of scarlet fever characterized by ulcerated or putrid
   sore throat.
   1913 webster

Canker >> C Words
Canker, definition of term: Canker
canker_pag1.html

Rash >> R Words
Rash, definition of term: Rash
rash_pag1.html

Canker Blossom >> C Words
Canker Blossom, definition of term: Canker Blossom
canker+blossom_pag1.html

Skin Rash >> S Words
Skin Rash, definition of term: Skin Rash
skin+rash_pag1.html