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O

Onchocerciasis

Etiology: 
 

Cause: Onchocerca volvulus

 

Description: initially painless skin nodules that progressively become very itchy due to dead larvae; chronic itching leads to permanent skin color changes (leopard skin)

Onycholysis

Etiology: 
 

Cause: idiopathic or secondary to trauma, skin disease, nail infections, tumors, or systemic events

 

Description: well-defined area of white opaque nail

 

Associated with: Psoriasis, Lichen Planus, Onychomycosis, Eczema

 

At risk: adult women

Onychomycosis

Etiology: 
 

  • Tx: 

    • Mild = 50/50 soak in vinegar/water 3x/wk; topical nail polish thing

    • Severe = oral terbinafine/griseofulvin

Osler nodes

Etiology: 
 

Cause: S. aureus (mostly), S. viridans (anything that can increase IC deposition)

 

Description: raised, violaceous lesions

 

Location: finger + toe pads

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