This is a VERY confusing topic form me !
How can you differentiate between Urticarial Rash or Morbilliform Rash as both are caused by nearly same agents , have the same distribution and in fact they both in many books carry the same description , in fact I believe in a clinical situation in a clinic or during practice unless you are an experienced dermatologist you'd be confused !
both are caused by Penicillins, Phenytoin, Quinolones , Sulfa drugs
the good thing that Antihistaminics are effective for both of them !
you may notice that Erythema Multiforme also may be caused by the same agents/ drugs , though this drug induced hypersenstivity skin manifestation in particular you should be highly aware of because it's more commonly caused by infective agents like Herpes , Hepatitis or Mycoplasma (trust me you will forget it !).
if it may help this website better describes Hives or Wheals to be an elevated papular lesions with well circumscribed edges, an Erythematous borders and Pale centers , which isn't the case for just diffusely Red simple maculopapular rash of Morbilliform rash
Morbilliform Rash !
this link is useful
http://missinglink.ucsf.edu/lm/dermatologyglossary/drugeruption.html
How can you differentiate between Urticarial Rash or Morbilliform Rash as both are caused by nearly same agents , have the same distribution and in fact they both in many books carry the same description , in fact I believe in a clinical situation in a clinic or during practice unless you are an experienced dermatologist you'd be confused !
both are caused by Penicillins, Phenytoin, Quinolones , Sulfa drugs
the good thing that Antihistaminics are effective for both of them !
you may notice that Erythema Multiforme also may be caused by the same agents/ drugs , though this drug induced hypersenstivity skin manifestation in particular you should be highly aware of because it's more commonly caused by infective agents like Herpes , Hepatitis or Mycoplasma (trust me you will forget it !).
if it may help this website better describes Hives or Wheals to be an elevated papular lesions with well circumscribed edges, an Erythematous borders and Pale centers , which isn't the case for just diffusely Red simple maculopapular rash of Morbilliform rash
Morbilliform Rash !
this link is useful
http://missinglink.ucsf.edu/lm/dermatologyglossary/drugeruption.html
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