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Erosions and ulcers

Some skin diseases are very prone to break down into sores. Surface sores are called erosions; these may start off as blisters or pustules. Full thickness sores are ulcers.

Ulcers on lower leg trauma

• Insect bites and stings Stasis/varicose/venous ulcers
• Pressure ulcers
• Hypertensive leg ulcers
• Arteriosclerotic ulcers 
• Neuropathic ulcers eg diabetic
• Ulcerating skin cancers (BCC, SCC, Melanoma) 
• Panniculitis
• Vasculitic ulcers e.g. cutaneous polyarteritis nodosa
• Pyoderma gangrenosum 
• Tropical ulcer
• Granulomatosis with polyangiitis

Ulcers due to picking

• Prurigo
• Dermatitis artefacta
• Compulsive skin picking
• Trigeminal trophic syndrome
• Delusions of parasitosis
• Morgellons disease

Ulcers on limbs &/or trunk

• Bacterial, viral or fungal infections in immune suppressed
• Mycosis fungoides
• Spider bites
• Atypical mycobacterial infections
• Genital conditions
• Porphyria cutanea tarda
• Erythropoeitic protoporphyria
• Wounds in general

Ulcers on head and neck

• Chondrodermatitis nodularis helicis (ear) 
• Erosive pustular dermatosis (scalp) 
• Aphthous ulcers (mouth and genitals) 
• Aplasia cutis (scalp) 
• Trigeminal trophic syndrome (nostril) 
• Ulcerating skin cancers (BCC, SCC, Melanoma)

Erosions

• Blistering skin diseases
• Erosive lichen planus
• Impetigo
• Candida
• Stevens-Johnson / toxic epidermal necrolysis
• Staph. scalded skin syndrome

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