||This lesion is variously known a a seborrhoeic keratosis, basal cell papilloma or
seborrhoeic wart. They are common in the elderly and have varying degrees of pigmentation from pale brown to
black. They have a characteristic 'stuck on' appearance. They can usually be easily differentiated from
malignant melanomas. Treatment is by superficial shaving or cautery.
||Congenital naevi can be single or multiple and vary greatly in size. They
are usually evenly pigmented with a regular border and may contain hairs. Giant pigmented naevi often occur in a
bathing trunk distribution. Histologically they can be compound or intradermal lesions. Giant naevi have a
propensity to malignant change and this can occur in childhood. Total excision and skin grafting of the naevus may
||This lesion is a benign Spitz naevus or juvenile melanoma. It has
distinctive clinical and histological features and its importance lies in the fact that histologically it can be difficult
to distinguish from a malignant melanoma. They usually occur in children and young adults with a predilection to
occur on the head, neck and lower limbs. Histologically the most important feature is symmetry of the lesion on low
power examination. Treatment is by local excision. Complete regression of lesions often occurs
||This pigmented skin lesion is a halo naevus. They may be multiple and occur
most commonly on the back of young adults. The halo is not a sinister feature and results from destruction of melanocytes
by a lymphocytic infiltrate. The area of depigmentation may persists for several years but re-pigmentation occurs in
almost all cases. No treatment is required unless there are other features that suggest malignant change.
||This rapidly growing, pedunculated lesion is a pyogenic granuloma. They
frequently occur on the hand following minor trauma. They increase in size over one or two weeks and if untreated
eventually regress. Histologically they are capillary haemangiomas. Surgical excision or curettage should be
considered if the lesion is painful or inconvenient.