Jump to content
  • Sign Up
Sign in to follow this  

Variant vs Subtype vs Phenotype

Recommended Posts

According to MedPlus Online Medical dictionary (Merriam-Webster) a variant is "manifesting variety or deviation : exhibiting variation." A subtype according to the same source is "a type that is subordinate to or included in another type."

So apparently a subtype is closer to the type while a variant is further from the type.

The classification of rosacea into subtypes and variants has been from the start controversial, when the NRS first began classifying rosacea into four subtypes and one variant in 2002. The only rosacea variant recognized by the NRS in 2002 was Granulomatous Rosacea. The RRDi has a much longer list of rosacea variants. The classifying of rosacea into subtypes has moved to the superior phenotype classification, therefor variants of rosacea are the current valid classification system, superior to the subtype classification

13 Variants of Rosacea

The RRDi recognizes these thirteen variants of rosacea: 

Demodectic Rosacea 

Gastrointestinal Rosacea [GR], aka, Gut Rosacea

Glandular Rosacea 

Granulomatous Rosacea

Halogen rosacea 

Idiopathic facial aseptic granuloma (IFAG) 

Neurogenic Rosacea 

Pyoderma Faciale 

Rosacea Conglobata 

Rosacea Fulminans 

Rosacea Lymphedema (Morbihan Disease)

Rosacea Perioral Dermatitis [RPD]

Steroid Rosacea

Please read this notice about Subtypes


Share this post

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

  • Create New...