- Single or often multiple plaques.
- A red surface with a thick scale is typical.
- Predilection for extensor surfaces.
- Lesions are often symmetrical.
- Involvement of the face is rare but the nails can be affected.
- Topical emollients, tar, salicylic acid, topical steroids, dithranol, calcipotriol or UV light.
- Systemic PUVA, retinoids, cytotoxics, systemic steroids, ciclosporin if severe.
Superficial basal cell carcinoma (BCC)
- Most commonly arise on the trunk.
- Usually present as a single lesion.
- Slow-growing pink or brown scaly plaque with a fine whipcord edge.
- Can grow to greater than 10cm in diameter.
- Usually mistakenly diagnosed as psoriasis or eczema but fail to respond to conventional therapy.
- Thought to be associated with prolonged sun exposure.
- Also occur in scars caused by X-rays, vaccination or trauma.
- Treatment is ideally by excision, curettage and cautery or cryotherapy, or radiotherapy where appropriate.
- In general the cure rate is >95 per cent.
- Regular follow up is important to detect recurrence and new lesions.