Treatment
Treatment is indicated for cosmesis or for concern about malignancy. Excision should be complete in most cases, with at least a 3 mm margin if melanoma is strongly suspected.
BENIGN ADNEXAL TUMOURS
Syringoma
Syringomas are benign proliferations arising from eccrine sweat glands. They are characterized by small papules that are often multiple and bilateral (Fig. 1.11).
Pilomatricoma
Pilomatricoma (pilomatrixoma, calcifying epithelioma of Malherbe) is derived from the germinal matrix cells of the hair bulb and is the commonest hair follicle proliferation seen by
Fig. 1.9 Congenital melanocytic naevus. (A) Split naevus; (B) split naevus containing hair; (C) extensive cutaneous involvement
(Courtesy of A Pearson – fig. B; U Raina – fig. C)
Fig. 1.10 Acquired melanocytic naevus. (A) Junctional naevus; (B) histopathology shows heavily pigmented naevus cells at the epidermal/dermal junction; (C) compound naevus; (D) histopathology shows naevus cells both at the epidermal/dermal junction and within the dermis; (E) intradermal naevus; (F) histopathology shows naevus cells within the dermis separated from the epidermis by a clear zone
(Courtesy of J Harry – figs B, D and F)
Miscellaneous Benign Tumours