Image references

Onycholysis: 2013 Alborz Fallah, licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license

Guttate psoriasis: 2010 Bobjgalindo, licensed under the Creative Commons Attribution-Share Alike 4.0 International, 3.0 Unported, 2.5 Generic, 2.0 Generic and 1.0 Generic license and GNU Free Documentation licence 1.2

Plaque psoriasis: 2004 Marnanel, licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license and GNU Free Documentation licence 1.2

Vitiligo: Produnis, licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license and GNU Free Documentation licence 1.2

Seborrhoeic keratosis: James Heilman, licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license

BCC: 2006 John Hendrix, in public domain

Neurofibromatosis: 2008 Almazi, in public domain

Clubbing: 2009 Desherinka, licensed under the Creative Commons Attribution-Share Alike 4.0 International, 3.0 Unported, 2.5 Generic, 2.0 Generic and 1.0 Generic license and GNU Free Documentation licence 1.2